The 1954 United States Senate election in Iowa took place on November 2, 1954. Incumbent Democratic Senator Guy Gillette ran for re-election but was defeated in an upset by Republican U.S. Representative Thomas E. Martin.
This was the fifth consecutive election in which the incumbent lost and this seat changed parties.
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Text from the Wikipedia article “1954 United States Senate election in Iowa”, available under CC BY-SA 4.0.