The tight clustering of probabilities across turnout bins from 2.75M–3.2M+ reflects uncertainty over voter mobilization in the November 3, 2026, Arizona gubernatorial contest between Democratic incumbent Katie Hobbs and Republican nominee Andy Biggs. Recent primary results and polling averages showing a narrow Hobbs lead in this swing state have heightened both parties' focus on ground operations, early voting, and absentee ballot outreach, which historically lift participation in competitive races. Factors such as enthusiasm gaps among key voting blocs, campaign spending on turnout infrastructure, and any late-cycle developments in the national environment could shift final numbers within the expected range, while structural elements like Arizona's mail voting rules and population growth provide a baseline for moderate-to-high participation without pushing toward extremes.