Stacy Garrity holds a commanding lead in the Pennsylvania Republican primary for governor due to her established statewide profile as treasurer, early fundraising strength, and consolidation of party support ahead of the 2026 cycle. Doug Mastriano’s 0.7% share reflects his 2022 general election defeat and limited primary momentum, while John Ventre trails further behind with minimal organizational backing. Traders price this outcome based on the absence of viable challengers entering the race and Garrity’s alignment with key Republican donors and county committees. Scenarios that could still shift probabilities include a late major announcement by another candidate, an unforeseen scandal, or health-related developments that reopen the field before the primary ballot closes.