1966 United States Senate elections

The 1966 United States Senate elections were elections on November 8, 1966, for the United States Senate which occurred midway through the second (and only full) 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.

1966 United States Senate elections

November 8, 1966

35 of the 100 seats in the United States Senate
51 seats needed for a majority
  Majority party Minority party
 
Leader Mike Mansfield Everett Dirksen
Party Democratic Republican
Leader since January 3, 1961 January 3, 1959
Leader's seat Montana Illinois
Seats before 67 33
Seats after 64 36
Seat change 3 3
Popular vote 12,971,141 13,654,168
Percentage 48.1% 50.6%
Seats up 20 15
Races won 17 18

Results of the elections:
     Democratic hold
     Republican gain      Republican hold
     No election
Rectangular inset (S. C. and Va.): both seats up for election

Majority Leader before election

Mike Mansfield
Democratic

Elected Majority Leader

Mike Mansfield
Democratic

These were also the first elections held after the enactment of the Voting Rights Act of 1965. Upon Edward Brooke's election in Massachusetts, he became the first African-American U.S. Senator elected after the end of Reconstruction and the first-ever popularly elected, as Reconstruction ended before the passage of the Seventeenth Amendment to the United States Constitution. As of 2024, this is the most recent Senate election cycle in which no House incumbents were elected to the Senate and the last time any state elected different parties to each Senate seat in a double barrel election.

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