California voters will decide Proposition 4 on November 3, 2026, a legislative measure that would repeal the 1988 ban on public campaign financing and permit state and local governments to establish optional programs with spending limits and qualification criteria. Trader sentiment favoring rejection at 56.5% reflects the absence of recent statewide polling showing majority support, combined with ongoing voter priorities around affordability and fiscal restraint amid multiple competing ballot measures. Advocacy from groups such as Common Cause and the League of Women Voters has advanced the measure since its legislative passage via SB 42 in 2025, yet limited high-profile endorsements and typical skepticism toward taxpayer-funded candidate support have kept implied probabilities near even. The outcome hinges on turnout dynamics and whether reform messaging overcomes perceptions of added government spending before Election Day.