Herb Kohl Democratic Herb Kohl Democratic The 2006 United States Senate election in Wisconsin was held November 7, 2006.

Senator Herb Kohl won re-election to his fourth and final term in a landslide.

[1] As of 2025, this is the most recent state-wide election where any candidate won every county in Wisconsin.

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.