The 2010 United States Senate election in Utah took place on November 2, 2010 along with other midterm elections throughout the United States. Incumbent Republican U.S. Senator Bob Bennett was seeking re-election to a fourth term, but was eliminated in the GOP state convention. Republican Mike Lee, who won the Republican primary, won the open seat.
The filing period for candidates began March 12, 2010 and ended March 19, 2010. Candidates who had not filed by that date cannot appear on the ballot in November. There are eleven candidates that have filed with the Office of the Lieutenant Governor.
Both the Utah State Democratic Party and the Utah State Republican Party held statewide caucus meetings on March 23, 2010. Caucus meetings are grouped by legislative district and divided by precincts with each precinct electing delegates who attend their respective party's state nominating convention.
The Utah State Democratic and Republican Parties held their conventions on May 8, 2010. At the Republican convention, incumbent Senator Bob Bennett finished third in balloting among delegates and was eliminated from the race. Business owner Tim Bridgewater finished first and attorney Mike Lee finished second, but Bridgewater did not receive enough votes (he needed more than 60 percent) to avoid a primary election runoff against Lee. At the Democratic convention, delegates nominated businessman Sam Granato, who received 77.5 percent of the vote.
In the Republican primary election, held on June 22, 2010, Lee became the Republican nominee by winning 51 percent of the vote against Bridgewater's 49 percent.
The general election was held on November 2, 2010. Lee won the election with 62 percent of the vote to Granato's 33 percent and 6 percent for Constitution Party candidate Scott Bradley.
Granato emphasized his opposition to nuclear weapon tests in neighboring Nevada. In addition, he criticized Lee for his support of raising the retirement age and for questioning the constitutionality of Social Security.