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 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 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 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 cycle coincided with Democratic gains in the House in the same year.
The 1958 United States Senate elections were elections for the United States Senate which occurred in the middle of President Dwight D. Eisenhower's second term. Thirty-two seats of Class 1 were contested in regular elections, the new state of Alaska held its first Senate elections for its Class 2 and 3 seats, and two special elections were held to fill vacancies.
The 1978 United States Senate election in Maine was held on November 7, 1978. Incumbent Democratic U.S. Senator William Hathaway ran for re-election to a second term, but was defeated by William Cohen, the Republican U.S. Representative from Maine's 2nd congressional district.
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 1972 United States Senate election in Maine was held on November 7, 1972. Incumbent Republican U.S. Senator Margaret Chase Smith ran for re-election to a fifth term, but was defeated by Democrat William Hathaway. As of 2023, this was the last time the Democrats won the Class 2 Senate seat from Maine.
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 1940 United States Senate election in Maine was held on September 9, 1940.
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 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 1916 United States Senate election in Maine was held on September 11, 1916.
The 1918 United States Senate election in Maine was held on September 9, 1918.
The 1922 United States Senate election in Maine was held on September 11, 1922, to elect a United States senator from Maine. Incumbent Senator Frederick Hale was re-elected to a second term.
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 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.
