The competitive nature of Arizona's 2026 gubernatorial race, with both major-party candidates actively mobilizing core supporters and independents, is the primary factor keeping projected turnout tightly clustered around 2.5-2.9 million votes. Early and mail-in ballot trends, combined with ongoing registration drives in suburban and rural counties, are providing real-time signals that traders are weighing against historical participation rates. National political momentum and local campaign events through early November could further influence absentee and Election Day volume, while structural elements like Arizona's established mail voting system and demographic shifts among swing voters sustain the narrow spread across leading ranges.