California Proposition 4 would repeal the state's longstanding ban on public campaign financing and authorize state and local governments to establish voluntary programs with spending limits and eligibility rules. Legislative referral via SB 42 in 2025 and subsequent qualification for the November 3, 2026 ballot set the current timeline, while organized opposition from groups such as the California Taxpayers Association highlights taxpayer costs and historical voter rejection of similar proposals. Supporter campaigns launched early in 2026 emphasize small-donor matching and reduced special-interest influence, yet the absence of major recent endorsements or polling shifts has sustained trader consensus slightly favoring rejection at the implied 55.5% probability for "No." Resolution depends on the statewide vote count that evening.