The 1984 United States Senate elections were held on November 6, with the 33 seats of Class 2 contested in regular elections. They coincided with the landslide re-election of President Ronald Reagan in the presidential election. In spite of the lopsided presidential race, Reagan's Republican Party suffered a net loss of two Senate seats to the Democrats, although it retained control of the Senate with a reduced 53-47 majority. Democrats defeated incumbents in Illinois and Iowa, and won an open seat in Tennessee, while Republicans defeated an incumbent in Kentucky. Results summary Source: Office of the Clerk Gains, losses, and holds Retirements Two Republicans and two Democrats retired instead of seeking re-election. Defeats Two Republicans and one Democrat sought re-election but lost in the general election. Change in composition Before the elections After the elections Race summary Special elections There were no special elections to the U.S. Senate in 1984. Elections leading to the next Congress In these general elections, the winners were elected for the term beginning January 3, 1985; ordered by state. All of the elections involved the Class 2 seats. Closest races In six races the margin of victory was under 10%. Minnesota was the tipping point state with a margin of victory of 16.8%. Alabama Alaska Incumbent Republican Ted Stevens sought re-election to a fourth term. Owing to his popularity and the conservative bent of Alaska, Stevens did not face major opposition, and easily defeated former Alaska Attorney General John Havelock in the general election. Arkansas Incumbent Democrat David Pryor won re-election to a second term over Republican U.S. Representative Ed Bethune. Colorado Incumbent Republican William L. Armstrong won re-election to a second term over Democrat Lieutenant Governor of Colorado Nancy E. Dick. Delaware Incumbent Democrat and future President of the United States Joe Biden won re-election to a third term, defeating Republican challenger John M. Burris, former Majority Leader of the Delaware House of Representatives. Georgia Incumbent Democrat Sam Nunn won re-election to a third term over Republican educator, Mike Hicks Idaho Incumbent Republican James A. McClure won re-election to a third term over Democratic Vietnam War veteran, Peter M. Busch. Illinois Incumbent Republican Charles H. Percy ran for re-election to a fourth term in the United States Senate. Senator Percy was opposed by Democratic nominee Paul Simon, who was a United States Congressman from Illinois's 22nd congressional district. The campaign between Percy and Simon