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.
The 1978 United States Senate elections were held on November 7, in the middle of Democratic President Jimmy Carter's term. The 33 seats of Class 2 were contested in regular elections. Special elections were also held to fill vacancies.
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 2023, this was the last time either party has had a two-thirds majority in the Senate, which allowed the Senate Democrats to override a veto, propose constitutional amendments, or convict and expel certain officials without any votes from Senate Republicans. However, internal divisions would have prevented the Democrats from having done so. The Senate election cycle coincided with Democratic gains in the House in the same year.
The 1952 United States Senate elections was an election for the United States Senate which coincided with the election of Dwight D. Eisenhower to the presidency by a large margin. The 32 Senate seats of Class 1 were contested in regular elections, and three special elections were held to fill vacancies. The Republicans took control of the Senate by managing to make a net gain of two seats. However, Wayne Morse (R-OR) became an independent forcing Republicans to rely on Vice President Richard Nixon's tie-breaking vote, although Republicans maintained a 48–47–1 plurality. Throughout the next Congress, Republicans were able to restore their 49–46–1 majority. This was the third time, as well as second consecutive, in which a sitting Senate leader lost his seat.
The 1936 United States Senate elections coincided with the reelection of President Franklin D. Roosevelt. The 32 seats of Class 2 were contested in regular elections, and special elections were held to fill vacancies. The Great Depression continued and voters backed progressive candidates favoring Roosevelt's New Deal in races across the country. The Democrats gained 5 net seats during the election, and in combination with Democratic and Farmer–Labor interim appointments and the defection of George W. Norris from the Republican Party to become independent, the Republicans were reduced to 16 seats. Democrats gained a further two seats due to mid-term vacancies. The Democrats' 77 seats and their 62-seat majority remain their largest in history.
The 1930 United States Senate elections occurred in the middle of Republican President Herbert Hoover's term. The 32 seats of Class 2 were contested in regular elections, and special elections were held to fill vacancies. With the Great Depression beginning to take hold, Republican incumbents became unpopular, and Democrats picked up a net of eight seats, erasing the Republican gains from the previous election cycle, however, Republicans retained control of the chamber. This was the first of four consecutive Senate elections during the Depression in which Democrats made enormous gains, achieving a cumulative pick-up of 34 seats.
The 1984 United States Senate election in Tennessee took place on November 6, 1984, to select the U.S. Senator from the state of Tennessee. Popular three-term Republican incumbent Howard Baker, who had served as United States Senate Majority Leader since 1981 decided not to seek re-election in order to concentrate on a planned bid for the 1988 Republican presidential nomination. This left the seat open.
The 1998 United States Senate election in Maryland was held November 3, 1998. Incumbent Democratic U.S. Senator Barbara Mikulski won re-election to a third term.
The 1992 United States Senate election in Maryland was held on November 3, 1992. Incumbent Democratic U.S. Senator Barbara Mikulski won re-election to a second term.
The 1986 United States Senate election in Maryland was held on November 4, 1986. Incumbent Republican U.S. Senator Charles Mathias Jr. decided to retire, instead of seeking a fourth term. Democratic U.S. Representative Barbara Mikulski defeated Reagan Administration official Linda Chavez for the open seat. Barbara Mikulski's swearing-in marked the first time since 1969 where Democrats held both Senate seats from Maryland.
The 1964 United States Senate special election in Tennessee was held on November 3, 1964, concurrently with the U.S. presidential election as well the other regularly scheduled U.S. Senate election, as well as other elections to the United States Senate in other states as well as elections to the United States House of Representatives and various state and local elections. Following the death of Senator Estes Kefauver, Governor Frank G. Clement appointed Herbert S. Walters to fill the vacancy until the special election could take place. Walters decided not to run in the special election. Democratic nominee Ross Bass won the election, defeating Republican Howard Baker with 52.1% of the vote.
The 1982 United States Senate election in Texas took place on November 2, 1982. Incumbent Democratic U.S. Senator Lloyd Bentsen won re-election to a third term in office, defeating Republican U.S. Representative James M. Collins.
The 1978 United States Senate election in Alaska was held on November 7, 1978. Incumbent Republican U.S. Senator Ted Stevens was re-elected to a third term in office, defeating Democrat Donald Hobbs.
The 1956 United States Senate election in Maryland was held on November 6, 1956. Incumbent Republican U.S. Senator John Marshall Butler was re-elected to a second term in office, defeating Democratic businessman George P. Mahoney.
The 1970 United States Senate election in Ohio took place on November 3, 1970. Incumbent Democratic Senator Stephen M. Young did not run for re-election to a third term in office. U.S. Representative Robert Taft Jr. won the open seat over Democrat Howard Metzenbaum.
The 1940 United States Senate election in Tennessee was held on November 5, 1940. Incumbent Democratic Senator Kenneth D. McKellar was re-elected to a fifth term in office, defeating Republican Howard Baker.
The 1964 United States Senate election in Maryland was held on November 3, 1964.
The 1966 United States Senate election in Tennessee was held on November 8, 1966, concurrently with other elections to the United States Senate in other states as well as elections to the United States House of Representatives and various state and local elections. Republican nominee Howard Baker won the election, defeating Democratic nominee and Tennessee Governor Frank G. Clement with 55.7% of the vote.
The 1972 United States Senate election in Kentucky took place on November 7, 1972. Incumbent Republican Senator John Sherman Cooper retired, and Democratic State Senator Walter Dee Huddleston narrowly won the open seat over former Republican Governor Louie Nunn.
The 1990 United States Senate election in Wyoming was held November 6, 1990. Incumbent Republican U.S. Senator Alan K. Simpson was elected to a third term in office.
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