United States Senate elections, 2016
| Democrat running Democrat retiring
Republican running Republican retiring
Elections for the United States Senate will be held on November 8, 2016, with 34 of the 100 seats in the Senate being contested in regular elections whose winners will serve six-year terms in the 115th United States Congress until January 3, 2023. All class 3 Senators are up for election; class 3 was last up for election in 2010, when Republicans won a net gain of six seats. Currently, Democrats are expected to have 10 seats up for election, and Republicans are expected to have 24 seats up for election. However, as of June 7, only 9 Democratic held seats are in contention, as the Democrats have already secured California, with the top two finishers in the California Senate jungle primary both being Democrats. Republicans, having taken control of the Senate in the 2014 election, currently hold the Senate majority with 54 seats.
- 1 Partisan composition
- 2 Change in composition
- 3 Latest predictions of competitive seats
- 4 Primary dates
- 5 Race summary
- 6 Complete list of races
- 6.1 Alabama
- 6.2 Alaska
- 6.3 Arizona
- 6.4 Arkansas
- 6.5 California
- 6.6 Colorado
- 6.7 Connecticut
- 6.8 Florida
- 6.9 Georgia
- 6.10 Hawaii
- 6.11 Idaho
- 6.12 Illinois
- 6.13 Indiana
- 6.14 Iowa
- 6.15 Kansas
- 6.16 Kentucky
- 6.17 Louisiana
- 6.18 Maryland
- 6.19 Missouri
- 6.20 Nevada
- 6.21 New Hampshire
- 6.22 New York
- 6.23 North Carolina
- 6.24 North Dakota
- 6.25 Ohio
- 6.26 Oklahoma
- 6.27 Oregon
- 6.28 Pennsylvania
- 6.29 South Carolina
- 6.30 South Dakota
- 6.31 Utah
- 6.32 Vermont
- 6.33 Washington
- 6.34 Wisconsin
- 7 See also
- 8 References
All 34 Class 3 Senators are up for election in 2016; Class 3 currently consists of 10 Democrats and 24 Republicans. Of the Senators not up for election, 35 Senators are Democrats, 30 Senators are Republicans and one Senator is an independent who caucuses with the Senate Democrats. If vacancies occur in Class 1 or Class 2 Senate seats, the state might require a special election to take place during the 114th Congress, possibly concurrently with the other 2016 Senate elections.
|Before these elections||44||54||2||100|
|Class 3 (2010→2016)||10||24||0||34|
|Special: All classes||0||0||0||0|
|Class 1 (2012→2018)||23||8||2||33|
|Class 2 (2014→2020)||11||22||0||33|
Change in composition
Before the elections
After the elections
Latest predictions of competitive seats
Several sites and individuals publish predictions of competitive seats. These predictions look at factors such as the strength of the incumbent (if the incumbent is running for re-election), the strength of the candidates, and the partisan leanings of the state (reflected in part by the state's Cook Partisan Voting Index rating). The predictions assign ratings to each seat, with the rating indicating the predicted advantage that a party has in winning that seat. Most election predictors use "tossup" to indicate that neither party has an advantage, "lean" to indicate that one party has a slight advantage, "likely" or "favored" to indicate that one party has a significant but not insurmountable advantage, and "safe" or "solid" to indicate that one party has a near-certain chance of victory. Some predictions also include a "tilt" rating that indicates that one party has an advantage that is not quite as strong as the "lean" rating would indicate.
All seats classified with at least one rating of anything other than "safe" or "solid" are listed below.
|Alaska||R+12||Murkowski, LisaLisa Murkowski (R)||39.5%||Likely R||Safe R||Safe R||Safe R||Safe R|
|Arizona||R+7||McCain, JohnJohn McCain (R)||59.2%||Lean R||Likely R||Lean R||Likely R||Likely R|
|Colorado||D+1||Bennet, MichaelMichael Bennet (D)||47.7%||Likely D||Safe D||Safe D||Safe D||Lean D|
|Florida||R+2||Rubio, MarcoMarco Rubio (R)||48.9%||Tossup||Lean R||Tilt R||Lean R||Lean R|
|Georgia||R+6||Isakson, JohnnyJohnny Isakson (R)||58.1%||Likely R||Safe R||Safe R||Safe R||Likely R|
|Illinois||D+8||Kirk, MarkMark Kirk (R)||48.2%||Lean D||Likely D||Lean D||Lean D||Tossup|
|Indiana||R+5||Coats, DanDan Coats (R)
|Iowa||D+1||Grassley, ChuckChuck Grassley (R)||64.5%||Likely R||Safe R||Safe R||Likely R||Lean R|
|Kentucky||R+13||Paul, RandRand Paul (R)||55.7%||Safe R||Safe R||Safe R||Safe R||Likely R|
|Louisiana||R+12||Vitter, DavidDavid Vitter (R)
|56.6%||Safe R||Likely R||Safe R||Safe R||Likely R|
|Missouri||R+5||Blunt, RoyRoy Blunt (R)||54.3%||Lean R||Lean R||Lean R||Lean R||Tossup|
|Nevada||D+2||Reid, HarryHarry Reid (D)
|New Hampshire||D+1||Ayotte, KellyKelly Ayotte (R)||60.2%||Tossup||Tossup||Tossup||Tossup||Tossup|
|North Carolina||R+3||Burr, RichardRichard Burr (R)||55.0%||Tossup||Lean R||Tilt R||Lean R||Tossup|
|Ohio||R+1||Portman, RobRob Portman (R)||57.3%||Lean R||Safe R||Lean R||Likely R||Likely R|
|Pennsylvania||D+1||Toomey, PatPat Toomey (R)||51.0%||Tossup||Tossup||Tossup||Tossup||Tossup|
|Wisconsin||D+2||Johnson, RonRon Johnson (R)||51.9%||Lean D||Likely D||Tilt D||Lean D||Lean D|
Cook, Sabato, Rothenberg, Daily Kos Elections, and Real Clear Politics consider the states listed below to be safe seats for the party currently holding the seat.
|Safe Republican||Safe Democratic|
|North Dakota||New York|
O indicates an open seat
This table shows the primary dates for regularly-scheduled elections. It also shows the type of primary.
- "Open" primary: any registered voter can vote in any party's primary
- "Closed" primary, only voters registered with a specific party can vote in that party's primary.
- "Top-two" primary, all candidates run against each other regardless of party affiliation, and the top two candidates advance to the second round of voting (in Louisiana, a candidate can win the election by winning a majority of the vote in the first round).
- All of the various other primary types are classified as "hybrid." Alaska in 2008 provides one example of a hybrid primary: the Democratic Party allowed unaffiliated voters to vote in its primary, while the Republican Party only allowed party members to vote in its primary.
|North Carolina||Mar 15||Hybrid|
|South Dakota||June 7R||Hybrid|
|North Dakota||June 14||Open|
|South Carolina||June 14R||Hybrid|
|New York||June 28||Closed|
|New Hampshire||Sep 13||Hybrid|
RIndicates a state that requires primary run-off elections under certain conditions.
|Alabama||Shelby, RichardRichard Shelby||Republican||1986
|Incumbent running.||Richard Shelby (Republican)
Ron Crumpton (Democratic)
|Alaska||Murkowski, LisaLisa Murkowski||Republican||2002 (Appointed)
|Incumbent running.||Lisa Murkowski (Republican)
Ray Metcalfe (Democratic)
Joe Miller (Libertarian)
Margaret Stock (Independent)
|Arizona||McCain, JohnJohn McCain||Republican||1986
|Incumbent running.||John McCain (Republican)
Ann Kirkpatrick (Democratic)
Merissa Hamilton (Libertarian/Write-in)
Gary Swing (Green/Write-in)
|Arkansas||Boozman, JohnJohn Boozman||Republican||2010||Incumbent running.||John Boozman (Republican)
Conner Eldridge (Democratic)
Frank Gilbert (Libertarian)
|California||Boxer, BarbaraBarbara Boxer||Democratic||1992
|Incumbent retiring.||Kamala Harris (Democratic)
Loretta Sanchez (Democratic)
|Colorado||Bennet, MichaelMichael Bennet||Democratic||2009 (Appointed)
|Incumbent running.||Michael Bennet (Democratic)
Darryl Glenn (Republican)
Lily Tang Williams (Libertarian)
Arn Menconi (Green)
|Connecticut||Blumenthal, RichardRichard Blumenthal||Democratic||2010||Incumbent running.||Richard Blumenthal (Democratic)
Dan Carter (Republican)
Richard Lion (Libertarian)
Jeff Russell (Green)
|Florida||Rubio, MarcoMarco Rubio||Republican||2010||Incumbent running.||Patrick Murphy (Democratic)
Marco Rubio (Republican)
Paul Stanton (Libertarian)
|Georgia||Isakson, JohnnyJohnny Isakson||Republican||2004
|Incumbent running.||Johnny Isakson (Republican)
Jim Barksdale (Democratic)
Allen Buckley (Libertarian)
|Hawaii||Schatz, BrianBrian Schatz||Democratic||2012 (Appointed)
|Incumbent running.||Brian Schatz (Democratic)
John Carroll (Republican)
Michael Kokoski (Libertarian)
|Idaho||Crapo, MikeMike Crapo||Republican||1998
|Incumbent running.||Mike Crapo (Republican)
Jerry Sturgill (Democratic)
|Illinois||Kirk, MarkMark Kirk||Republican||2010||Incumbent running.||Mark Kirk (Republican)
Tammy Duckworth (Democratic)
Kent McMillen (Libertarian)
Scott Summers (Green)
|Indiana||Coats, DanDan Coats||Republican||1989 (Appointed)
|Incumbent retiring.||Evan Bayh (Democratic)
Todd Young (Republican)
Lucy Brenton (Libertarian)
|Iowa||Grassley, ChuckChuck Grassley||Republican||1980
|Incumbent running.||Chuck Grassley (Republican)
Patty Judge (Democratic)
Chuck Aldrich (Libertarian)
|Kansas||Moran, JerryJerry Moran||Republican||2010||Incumbent running.||Jerry Moran (Republican)
Patrick Wiesner (Democratic)
Robert Garrard (Libertarian)
|Kentucky||Paul, RandRand Paul||Republican||2010||Incumbent running.||Jim Gray (Democratic)
Rand Paul (Republican)
|Louisiana||Vitter, DavidDavid Vitter||Republican||2004
|Incumbent retiring.||Charles Boustany (Republican)
Foster Campbell (Democratic)
Joseph Cao (Republican)
Donald "Crawdaddy" Crawford (Republican)
David Duke (Republican)
Derrick Edwards (Democratic)
Caroline Fayard (Democratic)
John Fleming (Republican)
John Kennedy (Republican)
Gary Landrieu (Democratic)
Rob Maness (Republican)
Charles Marsala (Republican)
Vinny Mendoza (Democratic)
Abhay Patel (Republican)
Josh Pellerin (Democratic)
Peter Williams (Democratic)
Thomas Clements (Libertarian)
LeRoy Gilliam (Libertarian)
|Maryland||Mikulski, BarbaraBarbara Mikulski||Democratic||1986
|Incumbent retiring.||Chris Van Hollen (Democratic)
Kathy Szeliga (Republican)
Margaret Flowers (Green)
|Missouri||Blunt, RoyRoy Blunt||Republican||2010||Incumbent running.||Roy Blunt (Republican)
Jason Kander (Democratic)
Jonathan Dine (Libertarian)
|Nevada||Reid, HarryHarry Reid||Democratic||1986
|Incumbent retiring.||Catherine Cortez Masto (Democratic)
Joe Heck (Republican)
|New Hampshire||Ayotte, KellyKelly Ayotte||Republican||2010||Incumbent running.||Kelly Ayotte (Republican)
Maggie Hassan (Democratic)
Brian Chabot (Libertarian)
|New York||Schumer, ChuckChuck Schumer||Democratic||1998
|Incumbent running.||Chuck Schumer (Democratic)
Wendy Long (Republican)
Alex Merced (Libertarian)
Robin Wilson (Green)
|North Carolina||Burr, RichardRichard Burr||Republican||2004
|Incumbent running.||Richard Burr (Republican)
Deborah Ross (Democratic)
Sean Haugh (Libertarian)
|North Dakota||Hoeven, JohnJohn Hoeven||Republican||2010||Incumbent running.||John Hoeven (Republican)
Eliot Glassheim (Democratic)
Robert Marquette (Libertarian)
|Ohio||Portman, RobRob Portman||Republican||2010||Incumbent running.||Rob Portman (Republican)
Ted Strickland (Democratic)
Joseph DeMare (Green)
|Oklahoma||Lankford, JamesJames Lankford||Republican||2014 (Special)||Incumbent running.||James Lankford (Republican)
Mike Workman (Democratic)
Robert Murphy (Libertarian)
|Oregon||Wyden, RonRon Wyden||Democratic||1996 (Special)
|Incumbent running.||Ron Wyden (Democratic)
Mark Callahan (Republican)
Jim Lindsay (Libertarian)
Eric Navickas (Green)
|Pennsylvania||Toomey, PatPat Toomey||Republican||2010||Incumbent running.||Pat Toomey (Republican)
Kathleen McGinty (Democratic)
Edward Clifford (Libertarian)
|South Carolina||Scott, TimTim Scott||Republican||2013 (Appointed)
|Incumbent running.||Tim Scott (Republican)
Thomas Dixon (Democratic)
Bill Bledsoe (Libertarian)
|South Dakota||Thune, JohnJohn Thune||Republican||2004
|Incumbent running.||John Thune (Republican)
Jay Williams (Democratic)
|Utah||Lee, MikeMike Lee||Republican||2010||Incumbent running.||Mike Lee (Republican)
Misty K. Snow (Democratic)
|Vermont||Leahy, PatrickPatrick Leahy||Democratic||1974
|Incumbent running.||Patrick Leahy (Democratic)
Scott Milne (Republican)
|Washington||Murray, PattyPatty Murray||Democratic||1992
|Incumbent running.||Patty Murray (Democratic)
Chris Vance (Republican)
|Wisconsin||Johnson, RonRon Johnson||Republican||2010||Incumbent running.||Russ Feingold (Democratic)
Ron Johnson (Republican)
Phil Anderson (Libertarian)
A grey shading indicates that the primaries have yet to take place for that race.
Complete list of races
Thirty-four seats are up for election in 2016:
- 7 Democrats and 21 Republicans are seeking re-election.
- 5 Senators (3 Democrats, 2 Republicans) are retiring.
Five-term Senator Richard Shelby (Republican) was re-elected with 65.3% of the vote in 2010. He will be 82 years old in 2016. He served in the Senate as a Democrat until switching parties in 1994. Shelby is running for re-election, and is facing four challengers in the Republican primary: ex-state Senator Shadrack McGill, former Marine and Birmingham businessman Jonathan McConnell, Marcus Bowman, and John Martin. On March 1, Shelby won the primary with 64.9% of the vote.
Two-term Senator Lisa Murkowski (Republican) was appointed in 2002 and elected to a full term in 2004. She was defeated in the Republican primary in 2010 by Joe Miller. She later ran as a write-in candidate in the 2010 general election and was re-elected to a second full term with 39.5% of the vote, making her one of two senators in US history to win election via write-in votes. She will be 59 years old in 2016 and is running for re-election.
Thomas Lamb, a candidate for the State House in 2006, and Bob Lochner have filed to run against Murkowski. Other potential Republican primary challengers include 2010 nominee and 2014 candidate Joe Miller, State Senator Mike J. Dunleavy, former Lieutenant Governor Mead Treadwell, and former Mayor of Anchorage Dan Sullivan.
The only person to have filed for the Democratic primary as of May 20 is writer and satirist Richard Grayson, who previously sought election to Wyoming's House seat in 2014. Potential Democratic candidates include State Senator Dennis Egan, State Representative Andy Josephson, State Senator Bill Wielechowski, State Senator Hollis French and State Senate Minority Leader Johnny Ellis. Former Senator Mark Begich was mentioned as a possible candidate, but has declined to run.
Murkowski won her primary on August 16, 2016 with 72 percent of the vote.
Joe Miller received the Libertarian nomination, and will run against Murkowski in the general election.
Five-term Senator and Republican presidential candidate in 2008 John McCain was re-elected with 59.3% of the vote in 2010. He will be 80 years old in 2016. Despite speculation that he might retire, McCain is running for re-election.
McCain is facing primary challenges from Fair Tax activist Alex Meluskey, businessman David Pizer, talk radio host Clair Van Steenwyk, and State Senator Kelli Ward are running for the Republican nomination. David Pizer has since dropped out of the race. Representatives Matt Salmon and David Schweikert were both mentioned as possible candidates, but both chose not to run. Other potential Republican candidates included former Governor Jan Brewer, businesswoman and 2014 gubernatorial candidate Christine Jones, former Governor of Alaska and 2008 vice presidential candidate Sarah Palin, former U.S. Representative John Shadegg, and former Arizona Attorney General Grant Woods.
Congresswoman Ann Kirkpatrick and teacher Lennie Clark were running for the Democratic nomination. Lennie Clark has since dropped out and Ann Kirkpatrick is the Democratic nominee. Other potential Democratic candidates include U.S. Representative Ruben Gallego, former Surgeon General and 2012 nominee Richard Carmona, 2014 gubernatorial nominee Fred DuVal, Phoenix Mayor Greg Stanton, and retired astronaut Mark Kelly, who is the husband of ex-Congresswoman Gabrielle Giffords.
One-term Senator John Boozman (Republican) defeated two-term Senator Blanche Lincoln with 58.0% of the vote in 2010. He will be 65 years old in 2016. Despite speculation that he might retire following health problems, Boozman is running for re-election. Fellow Republican Curtis Coleman, who ran against Boozman in 2010 but came in fifth place, is running again.
Four-term Senator Barbara Boxer (Democrat) was re-elected with 52.1% of the vote in 2010. Boxer declined to run for re-election. California Attorney General Kamala Harris and U.S. Representative Loretta Sanchez, both Democrats, finished first and second, respectively, in California's nonpartisan blanket primary, and will contest the general election. As such, Boxer's successor is guaranteed to be a Democrat. This marks a historic first such occasion in California, ever since the Senate elections began in 1914.
Other Democrats on the primary ballot included "President" Cristina Grappo, Massie Munroe, Herbert Peters, Emory Rogers, and Steve Stokes. Among the potential candidates who declined to run were Governor Jerry Brown, Lieutenant Governor Gavin Newsom, U.S. Representatives Xavier Becerra and Adam Schiff, and Los Angeles Mayor Eric Garcetti.
Former state Republican Party chairs Tom Del Beccaro and Duf Sundheim, and former State Senator Phil Wyman ran, along with Don Krampe, Tom Palzer, Karen Roseberry, Greg Conlon, Von Huogo, Jerry Laws, Ron Unz, Jarrell Williamson, and George Yang. State Assemblymen Rocky Chavez was running as well, but withdrew from the race. Republicans who were once considered potential candidates but ruled out runs included San Diego Mayor Kevin Faulconer, former Assistant Secretary of the Treasury for Financial Stability and 2014 gubernatorial nominee Neel Kashkari, U.S. Representative Darrell Issa, and businesswoman and nominee for the U.S. Senate in 2010 Carly Fiorina.
Polling conducted by the SurveyUSA from March 30, 2016 to April 3, 2016 indicated that Harris was ahead with 26%, compared to Rep. Sanchez with 22%, Del Beccaro with 8%, Wyman with 8%, and Sundheim with 3%; 7% of those polled were supporting other candidates, and 24% were undecided.
Businessman Robert Blaha, former Aurora councilman Ryan Frazier, El Paso County Commissioners Darryl Glenn, and Peggy Littleton, former Colorado State University Athletic Director Jack Graham, State Representative Jon Keyser, former SBA director Greg Lopez, State Senator Tim Neville, and Jefferson County Commissioner Donald Rosier ran for the Republican nomination. Glenn, Graham, Blaha, Keyser, and Frazier actually competed in the primary.
Darryl Glenn won the Republican nomination with 37% of the vote against four other opponents.
State Representative Dan Carter, apparel company CEO and 2004 Senate nominee Jack Orchulli, and former Olympic athlete August Wolf are running for the Republican nomination. Another potential candidate is former West Hartford Town Councilor Joe Visconti, who ran for CT-01 in 2008 and ran as an Independent for Governor in 2014. Former U.S. Comptroller General and 2014 candidate for Lieutenant Governor David M. Walker, former U.S. Representative and 2010 candidate Rob Simmons, and economist and former CNBC television host Lawrence Kudlow have declined to run.
One-term Senator Marco Rubio (Republican) was elected in a three-way race with 48.9% of the vote in 2010. In April 2014, Rubio stated that he would not run for both the Senate and President in 2016, as Florida law prohibits a candidate from appearing twice on a ballot. In April 2015, he announced that he would run for President and would not seek re-election. After suspending his campaign on March 15, 2016, Rubio announced on June 22, 2016 that he changed his mind and will run for re-election.
U.S. Representative Ron DeSantis, combat veteran Todd Wilcox, real estate developer Carlos Beruff, retired college lecturer Ilya Katz, and Donald J. DeRenzo are running for the Republican nomination. Ben Carson, retired neurosurgeon and candidate for President in 2016 is also mentioned as a potential candidate. On June 17, 2016, U.S. Representative David Jolly withdrew from the race to run for re-election to his House seat, four days after Rubio began openly considering reversing his decision to not run for re-election.
U.S. Representative Patrick Murphy defeated fellow representative Alan Grayson, as well as Pam Keith, Lateresa Jones, Richard Coleman, Sam Brian Gibbons, and Josh Larose, for the Democratic nomination. Murphy will face Marco Rubio in the November general election.
Two-term Senator Johnny Isakson (Republican) was re-elected with 58.1% of the vote in 2010. He will be 71 years old in 2016. He is running for re-election. In 2015, Isakson announced he was being treated for Parkinson's disease, but stated that his treatment would not interfere with his re-election campaign or his ability to serve another term.
Mary Kay Bacallao, college professor, former Fayette County Board of Education member, and candidate for State Superintendent of Schools in 2014 and Derrick Grayson, candidate for the state's other Senate seat in 2014, challenged Isakson for the Republican nomination. Isakson won the Republican nomination with more than three quarters of the vote.
Investment firm executive Jim Barksdale, project manager Cheryl Copeland, and businessman John Coyne ran for the Democratic nomination. USAF veteran Jim Knox was running but dropped out of the race. Barksdale defeated Copeland in a close race to win the Democratic nomination.
In 2012, Hawaii Governor Neil Abercrombie appointed Lieutenant Governor Brian Schatz (Democrat) to take the place of deceased nine-term Senator Daniel Inouye. Schatz won a 2014 special election to serve the remainder of Inouye's term. Schatz is running for re-election.
Former U.S. Representative and 2014 Senate candidate Colleen Hanabusa may challenge Schatz in the primary again, while U.S. Representative Tulsi Gabbard declined to seek the Democratic nomination for the seat.
Three-term Senator Mike Crapo (Republican) was re-elected with 71.1% of the vote in 2010. Crapo will be 65 years old in 2016. He is seeking re-election to a fourth term. U.S Representative Raul Labrador declined to challenge Crapo in the Republican primary.
Jerry Sturgill is running for the Democratic nomination.
One-term Senator Mark Kirk (Republican) was elected with 48.4% of the vote in 2010. He will be 57 years old in 2016. Kirk suffered a stroke in January 2012 that kept him away from the Senate until January 2013. In June 2013, he confirmed that he was planning to run for re-election, but speculation he might retire persisted. In November 2014, Kirk reiterated that he was going to run for re-election, saying: "No frickin' way am I retiring."
Joe Walsh, a former U.S. Representative and conservative talk radio host, declined to challenge Kirk in the Republican primary. Two others filed for the right to challenge Senator Kirk in the primary: businessman James Marter, and Elizabeth Pahlke, but Pahlke was disqualified, so only Marter was on the ballot running against Kirk. On March 15, Kirk won the primary with 70.6% of the vote.
U.S. Representative Tammy Duckworth, President and CEO of the Chicago Urban League Andrea Zopp, and State Senator Napoleon Harris ran for the Democratic nomination. On March 15, Duckworth won the primary with 64.4% of the vote.
In December 2015, Jim Brown, a teacher and former businessman, announced he is running as an independent.
Chris Aguayo, an Iraq/Afghan war Veteran and Veterans Party State Chair, announced he is running representing the Veterans Party.
Three-term Senator Dan Coats (Republican) was elected with 54.6% of the vote in 2010; Coats served in the Senate from 1989 to 1999 and then returned to serve another term from 2011 to 2017. Coats is not running for re-election. Republican candidates include U.S. Representatives Marlin Stutzman and Todd Young. Coats's chief of Staff Eric Holcomb was a candidate but withdrew from the race.
Former U.S. Representative Baron Hill won the Democratic nomination on May 3, but withdrew in July 2016 in favor of Evan Bayh. Bayh held the seat from 1999 until his retirement in 2011, and also served as Governor of Indiana from 1989 to 1997. Former non-profit director John Dickerson also announced he was going to run, but suspended his campaign in early 2016.
Six-term Senator Chuck Grassley was re-elected with 64.5% of the vote in 2010. He will be 83 years old in 2016. Grassley is running for re-election as the Republican nominee. Talk radio host Robert Rees announced he was going to challenge Grassley for the nomination, but later withdrew.
Former Lt Governor Patty Judge  earned the Democratic nomination by defeating State Senator Rob Hogg, former state Senator Tom Fiegen, and former state representative Bob Krause. Former state representative Ray Zirkelbach briefly ran but ended his campaign soon after.
One-term Senator Jerry Moran (Republican) was elected with 70.3% of the vote in 2010. He will be 62 years old in 2016. He is running for re-election. Radiologist and 2014 Senate candidate Milton R. Wolf is not committing to running and U.S. Representative Tim Huelskamp declined to run.
Patrick Wiesner, an attorney and a candidate for the Senate in 2010 and 2014, and Monique Singh-Bey have filed to run for the Democratic nomination. Other potential candidates include Wichita Mayor Carl Brewer, 2014 Governor nominee Paul Davis, former Kansas City Mayor Joe Reardon, former U.S. Representative and 2008 nominee Jim Slattery, and 2014 KS-02 nominee Margie Wakefield.
One-term Senator Rand Paul (Republican) was elected with 55.7% of the vote in 2010. He will be 53 years old in 2016. Paul has filed for re-election, although he was also running for President of the United States in 2016. Although Kentucky law does not allow for a candidate to appear twice on the same ballot, Paul successfully convinced the Kentucky GOP to adopt a caucus system for 2016, allowing Paul to run for president and for the Senate simultaneously. Kentucky law still bars Paul from appearing twice on the ballot in the general election. However, on February 3, 2016, Paul ended his campaign for the presidency and will run for reelection. James Gould and Stephen Slaughter filed to run against Paul. Paul won the primary with almost 85% of the vote.
Lexington Mayor Jim Gray, Rory Houlihan, Ron Leach, Sellus Wilder Jeff Kender, Tom Recktenwald (who was a candidate in 2014), and Grant Short ran for the Democratic nomination. Gray won the nomination.
Two-term Senator David Vitter (Republican) was re-elected with 56.6% of the vote in 2010. After losing the 2015 gubernatorial race, Vitter chose to retire from the Senate at the end of his term.
Republicans who are running for the seat include, but are not limited to, U.S. Representatives Charles Boustany and John Fleming, former U.S. Representative Joseph Cao, State Treasurer John Neely Kennedy, retired U.S. Air Force Colonel Rob Maness, and former Louisiana State Representative David Duke. Other potential Republican candidates are Public Service Commissioner Erik Skrmetta, 2014 candidate for LA-05 Zach Dasher, state representative Paul Hollis, and former President of Jefferson Parish John Young.
Democratic candidates include, but are not limited to, Public Service Commissioner Foster Campbell, attorney Derrick Edwards, Caroline Fayard, an attorney and candidate for Lieutenant Governor in 2010, and businessman Josh Pellerin. Other potential Democratic candidates include state legislators Robert Johnson, Eric LaFleur, and Gary Smith, Jr., and Mayor of Alexandria Jacques Roy. Former U.S. Senator Mary Landrieu and her brother, New Orleans Mayor Mitch Landrieu, declined to run.
Five-term Senator Barbara Mikulski (Democrat) was re-elected with 61.8% of the vote in 2010. She is the longest-serving female Senator and the longest-serving woman in the history of the U.S. Congress. She is not seeking reelection.
The candidates who have filed for the Democratic nomination are: U.S. Representatives Donna Edwards and Chris Van Hollen, Freddie Donald Dickson, Jr., Ralph Jaffe, Theresa Scaldaferri, Charles Smith, Violate Staley, Blaine Taylor, Ed Tinus, and Lih Young. Van Hollen won the April 26 primary.
The Republican candidates who have filed are former Deputy Assistant Secretary of Defense and Senate candidate in 2012 Richard Douglas, Chrys Kefalas, State Delegate Kathy Szeliga, Chris Chaffee, Sean Connor, John Graziani, Greg Holmes, Joseph David Hooe, Mark McNicholas, Lynn Richardson, Anthony Seda, Richard Shawver, Dave Walle, and Garry T. Yarrington. Szeliga won the primary and will face Van Hollen in the general election.
One-term Senator Roy Blunt (Republican) was elected with 54.3% of the vote in 2010. He will be 66 years old in 2016. He is running for re-election. Former U.S. Representative and 2012 Senate nominee Todd Akin was rumored to be a possible candidate, but declined to run. Two candidates are running against Blunt for the Republican nomination: sales manager, tea party activist, and 2010 candidate Kristi Nichols and retired Army sergeant and perennial candidate Bernie Mowinski.
For the Democrats, Secretary of State Jason Kander, Pastor Cori Bush, and activist Chief Wana Dubie are running. Governor Jay Nixon and State Treasurer Clint Zweifel chose not to seek election to the Senate.
Five-term Senator and Senate Minority Leader Harry Reid (Democrat) was re-elected with 50.2% of the vote in 2010. Reid is not seeking re-election. Former Nevada Attorney General Catherine Cortez Masto earned the Democratic nomination, defeating Bobby Mahendra, Liddo Susan O'Briant, and Allen Rheinhart in the primary on June 14, 2016. Heck defeated eight other candidates to win the Republican nomination, also on June 14, 2016.
Jarrod M. Williams, an independent candidate is running for the seat. He describes himself as a Democratic Socialist, a supporter of Bernie Sanders, and is a member of the Socialist Party USA, although the party doesn't have a chapter in the State of Nevada.
One-term Senator Kelly Ayotte (Republican) was elected with 60.2% of the vote in 2010. She will be 48 years old in 2016. Ayotte is running for re-election. If she does run, Ayotte may face a primary challenge from the Tea Party. Jim Rubens, a former state senator, candidate for Governor in 1998 and for the Senate in 2014, has announced a challenge to Ayotte in the primary.
Governor Maggie Hassan is running for the Democratic nomination. Other potential candidates include Executive Councilor Chris Pappas, State Senators Dan Feltes and Donna Soucy, Portsmouth City Councilor and daughter of U.S. Senator Jeanne Shaheen Stefany Shaheen, and campaign manager for Senator Shaheen Mike Vlacich.
A series of polls taken by WMUR/UNH in February, April, and July 2016, as well as WBUR polls taken in May and July/August, show Hassan gaining support over time and now leading Ayotte.
Three-term Senator Chuck Schumer (Democrat) was re-elected with 66% of the vote in 2010. He will be 66 years old in 2016. He is running for re-election. If reelected, Chuck Schumer is widely expected to succeed Harry Reid as the leader of the Senate Democrats.
Wendy Long, the Republican nominee in 2012, is running as the nominee of Republican, Conservative, and Reform Parties. Other potential Republican candidates included U.S. Representatives Chris Gibson and Peter T. King. U.S. Representative Richard L. Hanna, Manhattan Republican Party Chairwoman Adele Malpass, and former CNBC television host Larry Kudlow were also mentioned as possible candidates, but all have declined to run.
Two-term Senator Richard Burr (Republican) was re-elected with 55% of the vote in 2010. He will be 61 years old in 2016. There had been speculation that Burr might retire, but he is running for re-election.
Three Republicans challenged Sen. Burr in the primary: Greg Brannon, Larry Holmquist, and former Superior Court Judge Paul Wright. On March 15, Burr won the primary with 61.4% of the vote.
Former state representative Deborah Ross, Spring Lake Mayor Chris Rey, businessman Kevin Griffin, and retired U.S. Army Captain Ernest Reeves ran for the Democratic nomination. Former U.S. Senator Kay Hagan, state treasurer Janet Cowell, and Anthony Foxx, the United States Secretary of Transportation and former Mayor of Charlotte, declined to run. On March 15, Ross won the primary with 62.4% of the vote.
On November 7, 2015, the Libertarian party nominated Robert Marquette.
One-term Senator Rob Portman (Republican) was elected with 57.3% of the vote in 2010. He will be 60 years old in 2016. He is running for re-election. He had considered running for President, but decided not to.
Two candidates filed to challenge him: Don Elijah Eckhart, who ran for OH-15 as an independent in 2008, and Melissa Strzala, but Strzala was disqualified. On March 15, Portman won the primary with 82.2% of the vote.
Former Governor and Congressman Ted Strickland, Cincinnati City Councilman P.G. Sittenfeld, and occupational therapist Kelli Prather are running for the Democratic nomination. Former State Representative Bob Hagan had filed papers to run, but later withdrew from the race. On March 15, Strickland won the primary with 65% of the vote.
Joseph DeMare, a machinist from Bowling Green, is the Green Party candidate. He ran unopposed in the March 15, 2016 primary, and received enough votes to substantially increase the number of enrolled Green Party members. In Ohio, the only way to join a political party is to vote in that Party's primary.
Two-term Senator Tom Coburn (Republican) was re-elected with 70.64% of the vote in 2010, but chose to leave office before the end of his term after being diagnosed with prostate cancer. James Lankford won the 2014 special election to serve the remainder of Coburn's term. Lankford is running for re-election.
Former Congressman Dan Boren is viewed by some Oklahoma political operatives as the only Democrat who could make the 2016 race competitive, but is seen as unlikely to run. Lankford's 2014 special election opponent Constance N. Johnson has said that she plans to run again.
Information technology consultant and 2014 candidate Mark Callahan, businessman Sam Carpenter, business consultant Dan Laschober, Steven Reynolds, and Lane County commissioner Faye Stewart ran for the Republican nomination. Callahan won the Republican nomination.
Everett Stern, a security intelligence consultant and whistleblower of the HSBC money laundering scandal, announced that he would challenge Toomey for the Republican nomination, but has missed the filing deadline, so Toomey was unopposed in the primary.
Democratic candidates included Katie McGinty, former Chief of Staff to Governor Tom Wolf and former Secretary of the Pennsylvania Department of Environmental Protection, former Congressman Joe Sestak, who defeated incumbent Senator Arlen Specter for the 2010 Democratic nomination, but lost to Toomey in the general election, the current mayor of Braddock, Pennsylvania, John Fetterman, who is an AmeriCorps alum and Harvard University graduate, and small businessman and senate candidate in 2010 and 2012 Joseph Vodvarka. Allentown Mayor Ed Pawlowski announced his candidacy for the seat but suspended his campaign due to an FBI investigation of Allentown. McGinty won the primary and will face Toomey in the general election.
Two-term Republican Senator Jim DeMint (Republican) was re-elected with 61.48% of the vote in 2010. He resigned at the start of 2013 to become President of The Heritage Foundation and U.S. Representative Tim Scott (Republican) of South Carolina's 1st congressional district was appointed to replace him by Governor Nikki Haley. Scott subsequently won the special election in 2014 for the remaining two years of the term. Scott is running for re-election and he was a potential Republican vice presidential nominee.
Other potential Republican candidates include Congressmen Mick Mulvaney, Jeff Duncan and Mark Sanford, along with State Senator Tom Davis, State Treasurer Curtis Loftis and State Attorney General Alan Wilson. Darla Moore has also been mentioned as a potential candidate for either party.
On the Democratic side, pastor Thomas Dixon is running.
Jay Williams, Chair of the Yankton County Democratic Party, and candidate for the State House in 2010 and 2014, is running for the Democratic nomination. Other potential Democratic candidates include State Senator Bernie Hunhoff and filmmaker and former television news producer Sam Hurst. Former U.S. Representative Stephanie Herseth Sandlin, Sioux Falls Mayor Mike Heuther, and 2014 nominee Rick Weiland have declined to run.
One-term Senator Mike Lee (Republican) was elected with 61.6% of the vote in 2010. He will be 45 years old in 2016. He is running for re-election. State party chair Thomas Wright, former State Senator Dan Liljenquist, State Senator Aaron Osmond, Congressman Jason Chaffetz, Congressman Chris Stewart, former Governor of Utah Mike Leavitt, and Mitt Romney's son Josh Romney were mentioned as potential primary challengers, but they all declined to run. Lee ran unopposed at the Utah Republican convention and is the Republican nominee.
Marriage therapist Jonathan Swinton and grocery store clerk Misty Snow ran for the Democratic nomination. Snow defeated Swinton by more than 20 percentage points, and became the first transgender woman to become a major party's nominee for the Senate.
The only declared Republican candidate is former State Representative and former chair of the Washington State Republican Party Chris Vance. Congressman Dave Reichert was considered a potential Republican candidate but chose to run for reelection.
On May 14, 2015, Feingold announced that he would seek a rematch against Johnson for his former Senate seat. Immediately after his announcement, the Democratic Senatorial Campaign Committee endorsed Feingold's candidacy. Businesswoman and 2014 gubernatorial nominee Mary Burke has declared that she is not seeking statewide office in 2016.
- United States elections, 2016 (other elections being held at the same time)
- United States Senate elections, 2010 (the previous election for this class of Senators)