From West Allis, Wisconsin, Sanfelippo went to Marquette University and then opened a landscape company. Sanfelippo served on the Milwaukee County, Wisconsin Board of Supervisors. In November 2012, Sanfelippo was elected to the Wisconsin State Assembly as a Republican.[1][2]
On February 13, 2020, speaking on the radio for the Wisconsin Republican Party, and in support of a crime bill, Sanfelippo stated, "FBI data shows violent crime rates increased in all but two Wisconsin cities between 2008 and 2017."[3] The national media fact-checking organization, PolitiFact evaluated his claim and found it to be "Pants On Fire" in error. His conclusions were based on flawed data, and almost entirely false. Crime in fact had increased slightly in Milwaukee, but essentially nowhere else, according to state and FBI numbers. Some of those organizations and municipalities generating the numbers had also somewhat changed reporting systems, so it was not possible to establish Sanfelippo's claims as facts.[4]
After Joe Biden won the 2020 presidential election, Sanfelippo made unsubstantiated claims of voter fraud and suggested that Wisconsin should ignore the results of the election and that the state's electors should choose either Trump or Biden.[5][6] Sanfelipp also suggested nullifying the election results and holding a new election.[6]