Proxmire:      40–50%      50–60%      60–70%      70–80% Joseph McCarthy Republican William Proxmire Democratic The 1957 United States Senate special election in Wisconsin took place on August 27, 1957, to elect a U.S.

Wisconsin law did not allow for the appointment of an interim Senator until the special election could be held.

[1] Democratic nominee William Proxmire defeated Republican nominee and former Governor of Wisconsin Walter J. Kohler Jr.. Primary elections were held on July 30, 1957.

[2] The three minor candidates all technically ran as independents.

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