The 1964 United States Senate elections were held on November 3. The 33 seats of Class 1 were contested in regular elections. Special elections were also held to fill vacancies. They coincided with the election of President Lyndon B. Johnson by an overwhelming majority, to a full term. His Democratic Party picked up a net two seats from the Republicans. As of 2022, this was the last time either party has had a two-thirds majority in the Senate, which would have hypothetically allowed the Senate Democrats to override a veto, propose constitutional amendments, or convict and expel certain officials without any votes from Senate Republicans. In practice, however, internal divisions effectively prevented the Democrats from doing so. The Senate election coincided with Democratic gains in the House in the same year.
The 1952 United States Senate election in Arizona was held on November 4, 1952. Incumbent Democratic U.S. Senator and Senate Majority Leader Ernest McFarland ran for re-election to a third term, but was defeated by the Republican nominee and future candidate for President of the United States, Barry Goldwater.
The 1922 United States Senate elections in Arizona took place on November 7, 1922. Incumbent Democratic U.S. Senator Henry F. Ashurst ran for reelection to a third term, defeating Republican nominee James Harvey McClintock in the general election by a wide margin.
The 1928 United States Senate elections in Arizona took place on November 6, 1928. Incumbent Democratic U.S. Senator Henry F. Ashurst ran for reelection to a fourth term, defeating Republican nominee former U.S. Senator Ralph H. Cameron in the general election. Cameron was defeated in the previous election year, in 1926, by then-U.S. Congressman Carl T. Hayden, leading Cameron to decide to challenge Ashurst in order to return to the United States Senate.
The 1934 United States Senate elections in Arizona took place on November 3, 1934. Incumbent Democratic U.S. Senator Henry F. Ashurst ran for reelection to a fifth term, defeating Republican nominee Joseph Edward Thompson in the general election by a wide margin.
The 1946 United States Senate elections in Arizona took place on November 5, 1946. Incumbent Democratic U.S. Senator Ernest McFarland ran for reelection to a second term, easily defeating his Republican challenger Ward S. Powers in the general election.
The 1958 United States Senate elections in Arizona took place on November 4, 1958. Incumbent Republican U.S. Senator Barry Goldwater ran for reelection to a second term, and defeated former U.S. Senator, and then-Governor, Ernest McFarland in the general election. The election was a rematch from 1952, where Goldwater defeated McFarland by a narrow margin. Goldwater had attributed the 1952 win to the unpopularity of President Harry S. Truman and popular Wisconsin Senator Joseph McCarthy endorsing his campaign.
The 1964 United States Senate election in Arizona took place on November 3, 1964. Incumbent Republican U.S. Senator Barry Goldwater decided not to run for reelection 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.
The 1920 United States Senate elections in Arizona took place on November 2, 1920. Incumbent Democratic U.S. Senator Marcus A. Smith ran for reelection to a third term, but was defeated by former Delegate to the U.S. House of Representatives from the Arizona Territory Ralph H. Cameron in the general election. Cameron would become the first Republican elected to the office of U.S. Senator from Arizona since the state joined the union in 1912. The same year, Republican Governor Thomas Edward Campbell was reelected to a second term.
The 1944 United States Senate election in Arizona took place on November 7, 1944. Incumbent Democratic U.S. Senator Carl Hayden ran for reelection to a fourth term, defeating Republican nominee Fred Wildon Fickett Jr., in the general election.
The 1956 United States Senate election in Arizona took place on November 6, 1956. Incumbent Democratic U.S. Senator Carl Hayden ran for reelection to a sixth term, defeating Republican nominee Attorney General of Arizona Ross F. Jones in the general election.
The 1950 United States Senate elections in Arizona took place on November 7, 1950. Incumbent Democratic U.S. Senator Carl Hayden ran for reelection to a fifth term, defeating Republican nominee Bruce Brockett in the general election. Brockett was formerly the Republican nominee for governor in both 1946 and 1948.
The 1974 United States Senate election in Arizona took place on November 5, 1974. Incumbent Republican U.S. Senator Barry Goldwater decided to run for reelection to a second consecutive term, after returning to the U.S. Senate in 1968 following his failed Presidential run in 1964 against Lyndon B. Johnson. Goldwater defeated Democratic Party nominee philanthropist Jonathan Marshall in the general election.
The 1962 United States Senate election in Arizona took place on November 6, 1962. Incumbent Democratic U.S. Senator Carl Hayden ran for reelection to a seventh term, defeating Republican State Senator Evan Mecham in the general election. Mecham became Governor of Arizona more than two decades later, and was subsequently impeached and removed from office.
The 1980 United States Senate election in Arizona took place on November 4, 1980. Incumbent Republican Senator Barry Goldwater decided to run for reelection to a third consecutive term, after returning to the Senate in 1968 following his failed presidential run in 1964 against Lyndon B. Johnson. Despite Republican presidential nominee Ronald Reagan's landslide win in Arizona, Goldwater defeated Democratic Party nominee Bill Schulz in the general election by a narrow margin, which later caused Goldwater to decide against running for reelection to a fourth consecutive term. Goldwater won only three counties, including Maricopa County.
The 1916 United States Senate elections in Arizona took place on November 7, 1916. Incumbent Democratic U.S. Senator Henry F. Ashurst ran for reelection to a second term, defeating Republican former Territorial Governor Joseph H. Kibbey in the general election by a comfortable margin.
The 1954 Arizona gubernatorial election took place on November 2, 1954. Incumbent Governor John Howard Pyle, the first Republican elected to the office in two decades, ran for reelection for a third term.
The 1956 Arizona gubernatorial election took place on November 6, 1956. Incumbent Governor Ernest McFarland ran for reelection to a second term. Ernest McFarland defeated longtime The Arizona Republic journalist and Republican nominee Horace B. Griffen in the general election by a wide margin.
The 1958 Arizona gubernatorial election took place on November 4, 1958. Incumbent Governor Ernest McFarland decided not to run for reelection and instead unsuccessfully challenged U.S. Senator Barry Goldwater in attempt to return to the United States Senate.
The 1964 Arizona gubernatorial election took place on November 3, 1964. Incumbent Governor Paul Fannin decided not to run for reelection to a fourth term as governor, instead deciding to successfully run for the United States Senate when incumbent U.S. Senator Barry Goldwater decided to run for President of the United States.
