Thomas Nelson (born March 3, 1976) is an American Democratic politician and public administrator. He is the current county executive of Outagamie County, Wisconsin , serving since his election in April 2011, and is a candidate for United States Senate in the 2022 Democratic primary. He previously served six years in the Wisconsin State Assembly and was the Democratic majority leader for the 2009–2010 session . He was an unsuccessful candidate for United States House of Representatives in 2016 and for lieutenant governor in 2010 .