Previously, Knudson was a member of the Wisconsin State Assembly, representing parts of St. Croix and Pierce counties from 2011 to 2017.
They continued their veterinary practice and became involved in local affairs, including the Hudson Chamber of Commerce and Rotary Club.
[2] He left office in 2002 to devote more attention to his family and business, but, in 2008, Hudson's long-time Mayor, Jack Breault, announced he would not seek another term.
[6] Knudson was not opposed in the Republican primary and won a strong majority in the general election, defeating Democrat Matt Borup with 62% of the vote.
[12] Knudson was subsequently appointed by Speaker Robin Vos to replace him on the Wisconsin Elections Commission.
Knudson was the subject of public and personal attacks from elected Republicans and right wing commentators for much of 2021 and 2022, and also became a Republican target for voting with Democratic members of the commission to approve additional absentee voter options in the midst of the COVID-19 pandemic, although in most cases those decisions by the commission were unanimous.
Knudson was widely expected to be elected chair, but he surprised the state by announcing instead that he would resign from the commission because he felt he had lost the support of his party.
"[16] Knudson said he would continue to serve until his successor was named by Speaker Robin Vos, but would not accept the role of chairman.