California's deep Democratic voter registration advantage and consistent polling trends against Proposition 39 explain the 82.5% implied probability it fails. The initiative, which would require government-issued ID for in-person ballots and the last four digits of such an ID for mail ballots while mandating citizenship verification of rolls, qualified for the November 3, 2026 ballot after collecting over 1.3 million signatures. However, a September 2026 Public Policy Institute of California survey found 55% opposition versus 43% support. Opponents, including Governor Gavin Newsom and Attorney General Rob Bonta, frame the changes as unnecessary barriers in a state that already verifies eligibility at registration and uses signature matching. Heavy out-of-state Republican funding has not shifted the broader electorate in this solidly blue state, where similar election integrity measures have faced resistance.