Recent Republican Party of Wisconsin endorsement at its May 2026 state convention, combined with prior backing from President Trump and former Governor Tommy Thompson, has consolidated support behind U.S. Representative Tom Tiffany in the August 11 primary. Polling from Marquette University and others shows him leading fragmented challengers such as Andy Manske by wide margins, reflecting unified donor, activist, and institutional alignment in a low-turnout contest. Trader consensus prices this dominance at 90.5 percent, consistent with historical patterns where early frontrunners with broad endorsements rarely face late reversals. A major scandal or unexpected high-profile entry could still shift probabilities before the primary.