1964 United States Senate elections

Source: == Gains, losses, and holds ==

Retirements One Republican did not seek re-election and one Democrat did not seek election to finish an unexpired term. Defeats One Democrat sought election to finish the unexpired term but lost in the primary election. One Democrat sought election to a full term but lost in the general election. One Republican sought election to finish the unexpired term and sought election to a full term but lost in both the special election and the regular election. Two Republicans sought re-election but lost in the general election. Post-election changes One Democrat died on April 30, 1966, and was replaced on May 11, 1966, by a Republican appointee. Another Democrat died on April 18, 1965, and was replaced by a fellow Democrat. Another Democrat resigned on November 10, 1965, for health reasons and was replaced by a fellow Democrat. == Change in composition ==

Before the elections Elections results == Race summary ==

Special elections during the 88th Congress In these special elections, the winner was seated during 1964 or before January 3, 1965; ordered by election date, then state. Elections leading to the next Congress In these general elections, the winners were elected for the term beginning January 3, 1965; ordered by state. All of the elections involved the Class 1 seats. == Closest races ==

Fifteen races had a margin of victory under 10%: Michigan is the tipping point state with a margin of 29.1%. == Arizona ==

Incumbent Barry Goldwater decided not to run for re-election to a third term, instead running for President of the United States as the Republican Party nominee against Lyndon B. Johnson. Governor of Arizona Paul Fannin ran unopposed in the Republican primary, and defeated Democratic nominee Roy Elson, who was a staff member for U.S. senator Carl Hayden until Hayden's retirement in 1969. Despite a landslide loss throughout the country, and Goldwater only able to obtain 50.45% of the vote in his home state of Arizona, Fannin managed to prevail in the state's Senate election. Goldwater would win the election for the other Senate seat in 1968 when Hayden retired from the post and serving two more terms. == California ==

Democratic incumbent Pierre Salinger, who had been appointed to the seat following the death of Senator Clair Engle three months earlier, was defeated in his bid for a full term by Republican candidate George Murphy, a retired actor. == Connecticut ==

Democrat Thomas J. Dodd was re-elected and served a second term. John Davis Lodge, grandson of Henry Cabot Lodge was defeated by almost 30%. == Delaware ==

Republican incumbent John J. Williams was reelected to a fourth term, defeating Democratic Governor Elbert N. Carvel. == Florida ==

Democratic incumbent Spessard Holland was reelected to a fourth term in a landslide, defeating the Republican candidate, future governor Claude R. Kirk Jr. == Hawaii ==

Republican incumbent Hiram Fong was reelected to a second term, defeating Democratic Congressman Thomas Gill == Indiana ==

Democratic incumbent Vance Hartke was reelected to a second term, defeating Republican State Senator Russell Bontrager. == Maine ==

Democratic incumbent Edmund Muskie was reelected to a second term, defeating Republican Congressman Clifford McIntire in a landslide. == Maryland ==

Republican incumbent J. Glenn Beall was defeated in his bid for a third term by Democratic candidate Joseph Tydings, the former United States Attorney for the District of Maryland and son of former Senator Millard Tydings. Beall's own son, J. Glenn Beall Jr., would go on to defeat Tydings six years later. == Massachusetts ==

Kennedy Whitmore }} Incumbent Democrat Ted Kennedy, who had won a special election two years earlier, defeated his challengers to win his second (his first full) Senate term. Much of the campaign-appearance burden on behalf of Ted Kennedy fell on his wife, Joan, because of Ted's serious back injury in a plane crash. Candidates: • Ted Kennedy - Incumbent senator elected in 1962 to the unexpired term of John F. Kennedy. • Howard J. Whitmore Jr. - Member of Massachusetts House of Representatives from 1947 to 1953, and mayor of Newton, Massachusetts, from 1954 to 1960. Served in the United States Army Air Forces in World War II. • Lawrence Gilfedder - Candidate for Lt. Governor in 1948. Ran for Governor in 1952 and 1954. Ran for Senate in 1958, 1960, 1962, 1964, 1966, and 1970. • Grace F. Luder - Candidate for Massachusetts's 9th congressional district seat in 1950 and Massachusetts's 14th congressional district seat in 1952. == Michigan ==

Democratic incumbent Philip Hart was easily reelected to a second term over Republican challenger Elly M. Peterson. == Minnesota ==

Incumbent Democrat Eugene McCarthy defeated Republican challenger Wheelock Whitney Jr. to win a second term. == Mississippi ==

Democratic incumbent John C. Stennis was reelected virtually unopposed to a fourth term, even as Republican candidate Barry Goldwater carried Mississippi in the presidential election. Stennis received 97% of the vote in the Democratic primary and faced no Republican challenger in the general election. == Missouri ==

Democratic incumbent Stuart Symington was reelected to a third term in a landslide, defeating Republican candidate Jean Paul Bradshaw. == Montana ==

Incumbent Democrat Mike Mansfield, who was first elected to the Senate in 1952 and was re-elected in 1958, ran for re-election. Mansfield won the Democratic primary in a landslide, and advanced to the general election, where he faced Alex Blewett, the Majority Leader of the Montana House of Representatives and the Republican nominee. Though Mansfield's margin was significantly reduced from 1958, he still overwhelmingly defeated Blewett and won his third term in the Senate. == Nebraska ==