The 1936 United States Senate election in Iowa took place on November 3, 1936. Incumbent Republican Senator Lester J. Dickinson ran for re-election to a second term but was defeated by Democratic Governor Clyde L. Herring. This was the first time since 1855 that Democrats held both of the state's senate seats.
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Text from the Wikipedia article “1936 United States Senate election in Iowa”, available under CC BY-SA 4.0.