California Proposition 4 would repeal the state's long-standing ban on public campaign financing, permitting state and local governments to establish voluntary programs with spending limits, qualification thresholds, and safeguards against using dedicated funds for education, transportation, or public safety. Legislative passage occurred primarily along partisan lines in 2025, with organized support from groups such as the League of Women Voters, Common Cause, and the ACLU, while the California Taxpayers Association and fiscal watchdogs oppose the measure over concerns about taxpayer costs, administrative overhead, and potential diversion of resources during a period of state budget pressures. No recent statewide polling has emerged on the proposition, but trader consensus at 59.5% for defeat reflects historical voter resistance to public funding mechanisms, limited early visibility for the measure ahead of the November 2026 ballot, and the absence of broad bipartisan endorsement or major endorsements from elected officials.