2006 United States Senate election in Wisconsin

The 2006 United States Senate election in Wisconsin was held November 7, 2006. Incumbent Democratic U.S. Senator Herb Kohl won re-election to his fourth and final term in a landslide. As of 2024, this is the most recent state-wide election where any candidate won every county in Wisconsin.

Candidates

 * Herb Kohl, incumbent U.S. Senator
 * Ben Masel

Candidates

 * Robert Lorge, attorney

Candidates

 * Robert Lorge (R), attorney
 * Herbert Kohl (D), incumbent U.S. Senator
 * Rae Vogeler (G), community organizer

Counties that flipped Republican to Democratic

 * Calumet (largest city: Chilton)
 * Outagamie (largest city: Appleton)
 * Waupaca (largest city: New London)
 * Waushara (largest city: Berlin)
 * Green Lake (Largest city: Green Lake)
 * Ozaukee (Largest city: Mequon)
 * Washington (Largest city: West Bend)
 * Waukesha (Largest city: Waukesha)

Analysis
Kohl won every county in the state. Kohl's weakest performance in the state was suburban Washington County, Wisconsin, which Kohl won with just 49.6%. Kohl's strongest performance was in rural Menominee County, where he won with over 90% of the vote. Vogeler's best performance was in Dane County, where she came in third place with over 5%, a county where Lorge had his second weakest performance.