The 1930 United States Senate election in Iowa took place on November 4, 1930. Incumbent Democratic Senator Daniel F. Steck ran for re-election to a full term in office, but was defeated by U.S. Representative Lester J. Dickinson.
This was the only Senate seat Republicans gained in the 1930 elections.
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Text from the Wikipedia article “1930 United States Senate election in Iowa”, available under CC BY-SA 4.0.