The 1990 United States Senate elections were held on Tuesday, November 6, 1990, with the 33 seats of Class 2 contested in regular elections. Special elections were also held to fill vacancies. The Democratic Party increased its majority with a net gain of one seat from the Republican Party. The election cycle took place in the middle of President George H. W. Bush's term, and, as with most other midterm elections, the party not holding the presidency gained seats in Congress. Until 2022, this had been the only election cycle where only one U.S. Senate seat flipped parties.
The 1986 United States Senate elections were elections for the United States Senate. Held on November 4, in the middle of Ronald Reagan's second presidential term, the 34 seats of Class 3 were contested in regular elections. The Republicans had to defend an unusually large number of freshman Senate incumbents who had been elected on President Ronald Reagan's coattails in 1980. Democrats won a net of eight seats, defeating seven freshman incumbents, picking up two Republican-held open seats, and regaining control of the Senate for the first time since January 1981. This remains the most recent midterm election cycle in which the sitting president's party suffered net losses while still flipping a Senate seat.
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 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 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 1948 United States Senate election in Tennessee took place on November 2, 1948, concurrently with the U.S. presidential election, as well as 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. Incumbent Democratic Senator Tom Stewart was defeated in the Democratic primary by Estes Kefauver. In the general election, Kefauver defeated Republican Congressman B. Carroll Reece.
The 1976 United States Senate election in New York was held on November 2, 1976. Incumbent Republican U.S. Senator James L. Buckley ran for re-election to a second term, but was defeated by Democratic diplomat Pat Moynihan. As of 2023, this is the last time an incumbent Senator from New York lost re-election to this seat.
The 1970 United States Senate election in Maryland took place on November 3, 1970. Incumbent Democratic U.S. Senator Joseph Tydings ran for re-election to a second term, but was narrowly defeated by Republican U.S. Representative J. Glenn Beall Jr.
The 1978 United States Senate election in Tennessee took place on November 7, 1978, to select the U.S. Senator from the state of Tennessee. Two-term popular incumbent Republican U.S. Senator, Howard Baker, who had served as United States Senate Minority Leader since 1977, ran for re-election against first-time candidate and Democratic Party activist Jane Eskind. Baker won re-election in the general election.
The 1930 United States Senate special election in Tennessee took place on November 4, 1930, concurrently with other elections to the United States Senate as well as elections to the United States House of Representatives and various state and local elections. The special election came upon the death of incumbent Democratic Senator Lawrence D. Tyson. Democratic Governor Henry Hollis Horton appointed William E. Brock.
The 1934 United States Senate special election in Tennessee took place on November 6, 1934, concurrently with other elections to the United States Senate as well as elections to the United States House of Representatives and various state and local elections. The special election was held because incumbent Democratic Senator Cordell Hull resigned to accept the appointment of President Franklin D. Roosevelt to the office of Secretary of State.
The 1938 United States Senate special election in Tennessee took place on November 8, 1938, concurrently with other elections to the United States Senate as well as elections to the United States House of Representatives and various state and local elections. The special election came upon the death of incumbent Democratic Senator Nathan L. Bachman who had died in office.
The 1918 United States Senate election in Tennessee took place on November 5, 1918, concurrently with the United States Senate elections in other states as well as elections to the United States House of Representatives and various state and local elections. Incumbent Democratic Senator John K. Shields won re-election to a second term, defeating Republican candidate Henry Clay Evans.
The 1936 United States Senate election in Tennessee took place on November 3, 1936, concurrently with the U.S. presidential election, as well as 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. Incumbent Democratic Senator Nathan L. Bachman won re-election to a full term, defeating Republican candidate Dwayne D. Maddox.
The 1936 United States Senate election in Iowa took place on November 3, 1936. Incumbent Republican Senator Lester J. Dickinson ran for re-election to a second term but was defeated by Democratic Governor Clyde Herring.
The 1942 United States Senate election in Tennessee took place on November 3, 1942, concurrently with United States Senate elections in other states as well as elections to the United States House of Representatives and various state and local elections. Incumbent Democratic Senator Tom Stewart won re-election to a full term, defeating Republican candidate F. Todd Meacham.
The 1954 United States Senate election in Tennessee took place on November 2, 1954, concurrently with United States Senate elections in other states as well as elections to the United States House of Representatives and various state and local elections. Incumbent Democratic Senator Estes Kefauver won re-election, defeating Republican candidate Thomas P. Wall Jr.
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 1980 United States Senate election in Maryland took place on November 4, 1980.
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