U.S. Rep. Tom Tiffany commands 90.5% implied probability as the Republican primary winner for Wisconsin governor, reflecting trader consensus on his unchallenged path following President Trump's January 28 endorsement, which prompted rival Washington County Executive Josh Schoemann's withdrawal the same day and cleared most other contenders like Rebecca Kleefisch and Sean Duffy from active contention. With only Andrew Manske remaining as a minor challenger ahead of the August 11 primary, Tiffany's dominance stems from leading fundraising ($2 million by January), endorsements from Americans for Prosperity-Wisconsin, and broad GOP unity across grassroots and establishment donors. Scenarios like a late high-profile entrant, scandal, or polling surge for Manske could shift odds, though the focus has pivoted to the crowded Democratic primary.