The 1996 United States Senate elections were held on November 5, with the 33 seats of Class 2 contested in regular elections. Special elections were also held to fill vacancies. They coincided with the presidential election of the same year, in which Democrat Bill Clinton was re-elected president.
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 1968 United States Senate elections were elections for the United States Senate. Held on November 5, the 34 seats of Class 3 were contested in regular elections. They coincided with the presidential election of the same year. The Republicans picked up five net seats in the Senate. This saw Republicans win a Senate seat in Florida for the first time since Reconstruction.
The 1966 United States Senate elections were elections on November 8, 1966, for the United States Senate which occurred midway through the second term of President Lyndon B. Johnson. The 33 seats of Class 2 were contested in regular elections. Special elections were also held to fill vacancies. With divisions in the Democratic base over the Vietnam War, and with the traditional mid-term advantage of the party not holding the presidency, the Republicans took three Democratic seats, thereby breaking Democrats' 2/3rds supermajority. Despite Republican gains, the balance remained overwhelmingly in favor of the Democrats, who retained a 64–36 majority. Democrats were further reduced to 63–37, following the death of Robert F. Kennedy in June 1968.
The 1916 United States Senate elections were elections that coincided with the re-election of President Woodrow Wilson. This was the first election since the enactment of the Seventeenth Amendment that all 32 Class 1 Senators were selected by direct or popular elections instead of state legislatures. Republicans gained a net of two seats from the Democrats, and then a furthered seat through mid-term vacancies thereby reducing Democrats to a 53-43 majority.
The 1948 United States Senate election in Maine was held on September 13, 1948. Incumbent Republican U.S. Senator and Senate Majority Leader Wallace White did not seek a fourth term in office.
The 1930 United States Senate election in Maine was held on September 8, 1930. Incumbent Republican U.S. Senator Arthur Gould, who had been elected to complete the term of the late Senator Bert Fernald, did not run for re-election to a full term.
The 1936 United States Senate election in Maine was held on September 14, 1936. Incumbent Republican U.S. Senator Wallace White was re-elected to a second term over Governor Louis J. Brann.
The 1946 United States Senate election in Maine was held on September 9, 1946.
The 1942 United States Senate election in Maine was held on September 14, 1942. Incumbent Republican U.S. Senator Wallace White was re-elected to a third term over Fulton J. Redman.
The 1954 United States Senate election in Maine was held on September 13, 1954. Incumbent Republican U.S. Senator Margaret Chase Smith was re-elected to a second term over Democrat Paul Fullam.
The 1958 United States Senate election in Maine was held on September 8, 1958 to elect a United States senator. Incumbent Republican Senator Frederick G. Payne lost re-election to a second term.
The 1964 United States Senate election in Maine was held on November 3, 1964. Incumbent Democrat Edmund Muskie was re-elected to a second term in office over Republican U.S. Representative Clifford McIntire. This was the first senate race for this particular seat in which the election was held in November and not September. This was the first time since 1851 that an incumbent Democratic Senator from Maine was re-elected or won re-election.
The 1966 United States Senate election in Maine was held on November 8, 1966. Incumbent Republican U.S. Senator Margaret Chase Smith was re-elected to a fourth term over Democratic State Senator Elmer H. Violette.
The 1958 United States Senate election in Michigan was held on November 4, 1958.
The 1958 United States Senate election in Florida was held on November 4, 1958.
The 1916 United States Senate election in Maine was held on September 11, 1916.
The 1924 United States Senate election in Maine was held on September 8, 1924. Incumbent Republican U.S. Senator Bert Fernald overcame a challenge from U.S. Representative Frank E. Guernsey in the Republican primary. In the general election, Fernald was re-elected to a second term in office over Democratic newspaperman Fulton J. Redman.
The 1928 United States Senate election in Florida was held on November 6, 1928.
The 1960 United States Senate election in Maine was held on November 8, 1960. Incumbent Republican U.S. Senator Margaret Chase Smith was re-elected to a third term over Democratic State Senator Lucia Cormier.
