Tom Tiffany secured the Republican nomination for Wisconsin governor in the August 11 primary with roughly 95 percent of the vote, defeating limited challengers including Andy Manske. His position stems from early entry in September 2025, unified party support including endorsements from all Wisconsin congressional Republicans, and a Trump endorsement in January 2026 that prompted the main rival to exit. As the open-seat race follows decades without a contested GOP primary for the office, traders view the outcome as settled pending any final certification details. Late shifts remain possible only through extraordinary events such as vote recounts or eligibility challenges, though none are currently indicated.