United States Senate elections, 1966

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United States Senate elections, 1966
United States
← 1964 November 8, 1966 1968 →

33 of the 100 seats in the United States Senate, plus 2 mid-term vacancies
51 seats needed for a majority
  Majority party Minority party
  Michael Joseph Mansfield.jpg EverettDirksen.jpg
Leader Mike Mansfield Everett Dirksen
Party Democratic Republican
Leader's seat Montana Illinois
Last election 68 seats 32 seats
Seats before 67 33
Seats won 64 36
Seat change Decrease 3 Increase 3
Popular vote 12,358,323 13,169,332
Percentage 47.9% 51.0%
Swing Decrease 8.4% Increase 8.8%
Seats up 20 15

Us 1966 senate election map.svg
  Republican hold
  Republican gain
  Democratic hold
  Democratic gain

Majority Leader before election

Mike Mansfield

Elected Majority Leader

Mike Mansfield

The United States Senate elections, 1966 was an election on November 8, 1966 for the United States Senate which occurred midway through the second (only full) term of President Lyndon B. Johnson. With divisions in the Democratic base over the Vietnam War, and with the traditional mid-term advantage of the party not holding the presidency, the Republicans took three Democratic seats. Despite Republican gains, the balance remained overwhelmingly in favor of the Democrats, who retained a 64–36 majority. This was also the first election that occurred after the Voting Rights Act of 1965 became law.

Change in Senate composition[edit]

Before the elections[edit]

D1 D2 D3 D4 D5 D6 D7 D8 D9 D10
D20 D19 D18 D17 D16 D15 D14 D13 D12 D11
D21 D22 D23 D24 D25 D26 D27 D28 D29 D30
D40 D39 D38 D37 D36 D35 D34 D33 D32 D31
D41 D42 D43 D44 D45 D46 D47 D48 D49 D50
Majority → D51
D60 D59 D58 D57 D56 D55 D54 D53 D52
D61 D62 D63 D64 D65 D66 D67 R33 R32 R31
R21 R22 R23 R24 R25 R26 R27 R28 R29 R30
R20 R19 R18 R17 R16 R15 R14 R13 R12 R11
R1 R2 R3 R4 R5 R6 R7 R8 R9 R10

As a result of the elections[edit]

D1 D2 D3 D4 D5 D6 D7 D8 D9 D10
D20 D19 D18 D17 D16 D15 D14 D13 D12 D11
D21 D22 D23 D24 D25 D26 D27 D28 D29 D30
D40 D39 D38 D37 D36 D35 D34 D33 D32 D31
D41 D42 D43 D44 D45 D46 D47 D48 D49 D50
Majority → D51
D60 D59 D58 D57 D56 D55 D54 D53 D52
D61 D62 D63O D64O R36+ R35+ R34+ R33O R32O R31
R21 R22 R23 R24 R25 R26 R27 R28 R29 R30
R20 R19 R18 R17 R16 R15 R14 R13 R12 R11
R1 R2 R3 R4 R5 R6 R7 R8 R9 R10
D# Democratic
R# Republican
Incumbent re-elected or appointee elected to finish term
O Party hold: New senator elected from same party
+ Party gain: New senator elected from different party


Republican holds[edit]

  1. Massachusetts: Leverett Saltonstall (R) was replaced by Edward Brooke (R)
  2. Wyoming: Milward L. Simpson (R) was replaced by Clifford Hansen (R)

Republican gain[edit]

  1. Oregon: Maurine Brown Neuberger (D) was replaced by Mark Hatfield (R)

Incumbents who lost their seats[edit]

Democratic holds[edit]

  1. South Carolina: Appointee Donald S. Russell (D) lost nomination to finish the term to Ernest Hollings (D), who went on to win the general election
  2. Virginia: Absalom Willis Robertson (D) lost renomination to William B. Spong, Jr. (D), who went on to win the general election

Republican gains[edit]

  1. Illinois: Paul Douglas (D) lost to Charles H. Percy (R)
  2. Tennessee: Ross Bass (D) lost renomination to Frank G. Clement (D), who went on to lose the general election to Howard Baker (R)

Complete list of races[edit]

A bolded state name indicates an article about that state's election.

State Incumbent Party Result Candidates
Alabama John Sparkman Democratic Re-elected John Sparkman (Democratic) 60.1%
John Grenier (Republican) 39.0%
Alaska Bob Bartlett Democratic Re-elected Bob Bartlett (Democratic) 75.5%
Lee L. McKinley (Republican) 24.5%
Arkansas John Little McClellan Democratic Re-elected John Little McClellan (Democratic) unopposed
Colorado Gordon L. Allott Republican Re-elected Gordon L. Allott (Republican) 58.0%
Roy Romer (Democratic) 41.9%
Delaware J. Caleb Boggs Republican Re-elected J. Caleb Boggs (Republican) 59.1%
James M. Tunnell, Jr. (Democratic) 40.9%
Georgia Richard Russell, Jr. Democratic Re-elected Richard Russell, Jr. (Democratic) unopposed
Idaho Leonard B. Jordan Republican Re-elected Leonard B. Jordan (Republican) 55.4%
Ralph R. Harding (Democratic) 44.6%
Illinois Paul Douglas Democratic Lost re-election
Republican gain
Charles H. Percy (Republican) 55.0%
Paul Douglas (Democratic) 43.9%
Iowa Jack Miller Republican Re-elected Jack Miller (Republican) 60.9%
E. B. Smith (Democratic) 37.8%
Kansas James B. Pearson Republican Re-elected James B. Pearson (Republican) 52.2%
James Floyd Breeding (Democratic) 45.2%
Kentucky John Sherman Cooper Republican Re-elected John Sherman Cooper (Republican) 64.5%
John Y. Brown, Sr. (Democratic) 35.5%
Louisiana Allen J. Ellender Democratic Re-elected Allen J. Ellender (Democratic) unopposed
Maine Margaret Chase Smith Republican Re-elected Margaret Chase Smith (Republican) 59.0%
Elmer H. Violette (Democratic) 41.1%
Massachusetts Leverett Saltonstall Republican Retired
Republican hold
Edward Brooke (Republican) 60.7%
Endicott Peabody (Democratic) 38.7%
Michigan Robert P. Griffin Republican Re-elected Robert P. Griffin (Republican) 55.9%
G. Mennen Williams (Democratic) 43.8%
Minnesota Walter Mondale Democratic Appointee elected to full term Walter Mondale (Democratic) 53.9%
Robert A. Forsythe (Republican) 45.2%
Mississippi James Eastland Democratic Re-elected James Eastland (Democratic) 65.5%
Prentiss Walker (Republican) 26.8%
Clifton R. Whitley (Independent) 7.8%
Montana Lee Metcalf Democratic Re-elected Lee Metcalf (Democratic) 53.2%
Tim M. Babcock (Republican) 46.8%
Nebraska Carl Curtis Republican Re-elected Carl Curtis (Republican) 61.2%
Frank B. Morrison (Democratic) 38.8%
New Hampshire Thomas J. McIntyre Democratic Re-elected Thomas J. McIntyre (Democratic) 54.0%
Harrison Thyng (Republican) 45.9%
New Jersey Clifford P. Case Republican Re-elected Clifford P. Case (Republican) 60.0%
Warren W. Wilentz (Democratic) 37.0%
New Mexico Clinton Presba Anderson Democratic Re-elected Clinton Presba Anderson (Democratic) 53.1%
Anderson Carter (Republican) 46.9%
North Carolina B. Everett Jordan Democratic Re-elected B. Everett Jordan (Democratic) 55.6%
John S. Shallcross (Republican) 44.4%
Oklahoma Fred R. Harris Democratic Re-elected Fred R. Harris (Democratic) 53.7%
Pat H. Patterson (Republican) 46.3%
Oregon Maurine Brown Neuberger Democratic Retired
Republican gain
Mark Hatfield (Republican) 51.7%
Robert B. Duncan (Democratic) 48.2%
Rhode Island Claiborne Pell Democratic Re-elected Claiborne Pell (Democratic) 67.7%
Ruth M. Briggs (Republican) 32.3%
South Carolina Strom Thurmond Republican Re-elected Strom Thurmond (Republican) 62.2%
Bradley Morrah (Democratic) 37.8%
South Carolina
Special: Class 3
Donald S. Russell Democratic Lost nomination to finish term
Democratic hold
Ernest Hollings (Democratic) 51.4%
Marshall Parker (Republican) 48.7%
South Dakota Karl Earl Mundt Republican Re-elected Karl Earl Mundt (Republican) 66.3%
Donn H. Wright (Democratic) 33.7%
Tennessee Ross Bass Democratic Lost renomination
Republican gain
Howard Baker (Republican) 55.7%
Frank G. Clement (Democratic) 44.3%
Texas John Tower Republican Re-elected John Tower (Republican) 56.4%
Waggoner Carr (Democratic) 43.1%
Special: Class 1
Harry F. Byrd, Jr. Democratic Re-elected Harry F. Byrd, Jr. (Democratic) 53.3%
Lawrence M. Traylor (Republican) 37.4%
John W. Carter (Independent) 7.9%
Virginia Absalom Willis Robertson Democratic Lost renomination
Democratic hold
William B. Spong, Jr. (Democratic) 58.6%
James P. Ould, Jr. (Republican) 33.5%
F. Lee Hawthorne (Conservative) 7.9%
West Virginia Jennings Randolph Democratic Re-elected Jennings Randolph (Democratic) 59.5%
Francis J. Love (Republican) 40.5%
Wyoming Milward L. Simpson Republican Retired
Republican hold
Clifford Hansen (Republican) 51.8%
Teno Roncalio (Democratic) 48.2%

See also[edit]