1980 United States Senate election in Wisconsin

The 1980 United States Senate election in Wisconsin was held on November 4, 1980. Incumbent Democratic U.S. Senator Gaylord Nelson ran for re-election to a fourth term but was defeated by Bob Kasten, a Republican.

Candidates

 * Doug Cofrin, publisher of Milwaukee Magazine
 * Bob Kasten, former U.S. Representative
 * Terry Kohler, businessman
 * Russell Olson, Lieutenant Governor

Results
[[File:1980 US Senate election in Wisconsin Republican primary.svg|thumb|200px|Primary results by county: {{legend|#ed8783|Kasten}}

{{legend|#fdeeee|20–30%}}

{{legend|#fbdedd|30–40%}}

{{legend|#f1b4b2|40–50%}}

{{legend|#ed8783|50–60%}}

{{legend|#e55651|60–70%}} {{legend|#c88fe4|Kohler}}

{{legend|#f8effe|20–30%}}

{{legend|#f2dffc|30–40%}}

{{legend|#dcb7ef|40–50%}}

{{legend|#c88fe4|50–60%}} {{legend|#7bc7ae|Cofrin}}

{{legend|#d8f3ea|30–40%}}

{{legend|#a8dccb|40–50%}}

{{legend|#7bc7ae|50–60%}} {{legend|#8da9e2|Olson}}

{{legend|#b4c7ec|40–50%}} ]]