United States Senate election in Delaware, 1966

United States Senate elections, 1966

← 1964 November 8, 1966 1968 →
33 of the 100 seats in the United States Senate, plus 2 mid-term vacancies 51 seats needed for a majority
Majority party Minority party   Leader Mike Mansfield Everett Dirksen Party Democratic Republican Leader's seat Montana Illinois Seats before 67 33 Seats after 64 36 Seat change 3 3 Popular vote 12,358,323 13,169,332 Percentage 47.9% 51.0% Swing 8.4% 8.8% Seats up 18 15 Races won 15 18
Results (including special elections)      Democratic gain      Republican gain      Democratic hold      Republican hold
Majority Leader before election Mike Mansfield Democratic Elected Majority Leader Mike Mansfield Democratic

U.S. Senate election in Illinois, 1966

← 1960 November 8, 1966 1972 →
Nominee Charles Percy Paul Douglas Party Republican Democratic Popular vote 2,100,449 1,678,147 Percentage 54.95% 43.90%
U.S. Senator before election Paul Douglas Democratic Elected U.S. Senator Charles H. Percy Republican

U.S. Senate election in Massachusetts, 1966

← 1960 November 8, 1966 1972 →
Nominee Edward Brooke Endicott Peabody Party Republican Democratic Popular vote 1,213,473 774,761 Percentage 60.68% 38.74%
U.S. Senator before election Leverett Saltonstall Republican Elected U.S. Senator Edward Brooke Republican

U.S. Senate election in Montana, 1966

← 1960 November 8, 1966 1972 →
Nominee Lee Metcalf Tim Babcock Party Democratic Republican Popular vote 138,166 121,697 Percentage 53.17% 46.83%
U.S. Senator before election Lee Metcalf Democratic Elected U.S. Senator Lee Metcalf Democratic

U.S. Senate election in Oregon, 1966

← 1960 November 6, 1966 1972 →
Nominee Mark Hatfield Robert B. Duncan Party Republican Democratic Popular vote 354,391 330,374 Percentage 51.75% 47.25%
U.S. Senator before election Maurine Brown Neuberger Democratic Elected U.S. Senator Mark Hatfield Republican

U.S. Senate election in South Carolina, 1966

← 1960 November 8, 1966 1972 →
Nominee Strom Thurmond Bradley Morrah Party Republican Democratic Popular vote 271,297 164,955 Percentage 62.2% 37.8%
U.S. Senator before election Strom Thurmond Republican Elected U.S. Senator Strom Thurmond Republican

U.S. Senate election in Virginia, 1966

← 1960 November 8, 1966 1972 →
Nominee William B. Spong Jr. James P. Ould, Jr. F. Lee Hawthorne Party Democratic Republican Independent Popular vote 429,855 245,681 58,251 Percentage 58.6% 33.5% 7.9%
U.S. Senator before election A. Willis Robertson Democratic Elected U.S. Senator William B. Spong Jr. Democratic

U.S. Senate special election in Virginia, 1966

← 1964 November 8, 1966 1970 →
Nominee Harry F. Byrd Jr. Lawrence M. Traylor John W. Carter Party Democratic Republican Independent Popular vote 389,028 272,804 57,692 Percentage 53.3% 37.4% 7.9%
U.S. Senator before election Harry F. Byrd Jr. Democratic Elected U.S. Senator Harry F. Byrd Jr. Democratic

Mike Mansfield
Democratic

Mike Mansfield
Democratic

The United States Senate elections, 1966 was an election on November 8, 1966 for the United States Senate which occurred midway through the second (only full) term of President Lyndon B. Johnson. 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. Despite Republican gains, the balance remained overwhelmingly in favor of the Democrats, who retained a 64–36 majority. This was also the first election that occurred after the Voting Rights Act of 1965 became law.

In these special elections, the winner was seated during 1966 or before January 3, 1967; ordered by election date, then state.

In these general elections, the winners were elected for the term beginning January 3, 1967; ordered by state.

All of the elections involved the Class 2 seats.

Paul Douglas
Democratic

Charles H. Percy
Republican

Incumbent Democrat Paul Douglas, seeking a fourth term in the United States Senate, faced off against Republican Charles H. Percy, a businessman and the 1964 Republican nominee for Governor of Illinois. Also running was Robert Sabonjian (I), Mayor of Waukegan. A competitive election ensued, featuring campaign appearances by former Vice-President Richard M. Nixon on behalf of Percy. Ultimately, Percy ended up defeating Senator Douglas by a fairly wide margin, allowing him to win what would be the first of three terms in the Senate.

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