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 County results La Follete Jr.: 40–50% 50–60% 60–70% Clausen: 40–50% 50–60% 60–70% | |||||||||||||||||||||
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The 1940 United States Senate election in Wisconsin was held on November 5, 1940.
Incumbent Progressive U.S. Senator Robert La Follette Jr. was elected to a third term in office over Republican Fred H. Clausen and Democrat James E. Finnegan.