Republican Michael Alfonso has won Wisconsin's 7th Congressional District, securing the seat his father-in-law, Transportation Secretary Sean Duffy, once held. The victory makes Alfonso, at 26, the youngest member of the incoming House of Representatives.

Alfonso defeated Democrat Fred Clark, a former state lawmaker, with 56% of the vote compared to Clark's 44%, with nearly all ballots counted. His mother-in-law, Fox News personality Rachel Campos-Duffy, celebrated the win on social media, noting that Alfonso will be the first member of Congress born in the 21st century.

Alfonso is set to take the title of youngest lawmaker from Florida Democratic Rep. Maxwell Frost, who is 29. Alfonso's wife, Evita Duffy Alfonso, is Sean Duffy's eldest daughter.

Sean Duffy, a former MTV 'Real World' cast member, previously held the Northwoods district seat from 2010 until his resignation in 2019. His departure came ahead of the birth of his ninth child, who had a heart condition. Duffy's election in 2010 marked the end of a four-decade Democratic hold on the seat.

Alfonso, a native of the 7th District and graduate of the University of Wisconsin-Madison, worked in construction and produced Dan Bongino's podcast before launching his campaign. He pitched himself as a voice for "zoomer Wisconsinites." President Trump endorsed Alfonso in January, referring to him as a "MAGA Warrior."

Alfonso's path to the Republican nomination included a primary challenge from Kevin Hermening, a former Marine held hostage in Iran. According to PBS Wisconsin, Alfonso secured the nomination with the aid of Trump's endorsement and $1 million from his father-in-law's dormant campaign account, which was channeled through a super PAC.

Delta Air Lines was among the sponsors of a December fundraiser where Sean Duffy was a featured guest. Delta's PAC also contributed $5,000 to Alfonso's campaign. The Department of Transportation stated that Duffy's support for Alfonso was in a "personal capacity."

Alfonso won the five-way August primary with approximately 48% of the vote. Clark, 67, campaigned as an "independent-minded" Democrat and a former state legislator and forester. Alfonso will succeed Rep. Tom Tiffany (R-Wis.), who gave up the seat to run for governor but lost to Democrat David Crowley.