California Proposition 43 would amend the state constitution to extend the two-thirds voter approval requirement to citizen-initiated local special tax measures, closing the current simple-majority path for petition-driven proposals. Early PPIC polling from spring 2026 showed only 39 percent support among likely voters, with sharp partisan splits and opposition from local governments, unions, and service advocates who argue supermajority rules empower minorities to block needed revenues. The measure emerged from a June 2026 legislative compromise that prompted withdrawal of a broader taxpayer-protection initiative. With the November 3 election still months away and no dominant polling shifts, trader consensus at 35 percent Yes reflects historical patterns for tax-threshold ballot measures where organized opposition and turnout dynamics often limit passage.