California Proposition 4, referred by the legislature via SB 42, would repeal the 1988 voter-approved prohibition on public funds for campaigns and authorize state and local governments to design optional programs with spending limits and eligibility rules. Trader pricing favoring rejection at 59.5% reflects organized opposition from groups such as the California Taxpayers Association, which highlights taxpayer costs and past voter rejections of similar measures, alongside limited early opposition fundraising. Supporters including the League of Women Voters of California and California Common Cause launched campaigns in early 2026 emphasizing small-donor amplification, yet the market implies skepticism about passage amid broader voter caution on new public expenditures ahead of the November 3, 2026 ballot.