The United States Senate election of 1958 in Connecticut was held on November 4, 1958. Democratic Thomas J. Dodd defeated incumbent senator William A. Purtell who ran for a second term.

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1958 United States Senate election in Connecticut

← 1952 November 4, 1958 1964 →

Nominee Thomas J. Dodd William A. Purtell Party Democratic Republican Popular vote 554,841 410,622 Percentage 57.29% 42.40%

County results Municipality results Dodd:      50–60%      60–70%      70–80% Purtell:      50–60%      60–70%      70–80% Tie:      50%

U.S. senator before election William A. Purtell Republican Elected U.S. Senator Thomas J. Dodd Democratic

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This was one of ten 15 Democrats gained from the Republican Party in 1958, part of a record swing.

• 1958 United States Senate elections