Opposition from local governments, public employee unions, and service advocates has shaped trader sentiment against Proposition 43, which would impose a two-thirds voter threshold on citizen-initiated local special taxes and restrict certain property tax initiatives in charter cities. Fiscal analyses project annual local revenue losses potentially reaching billions, primarily in affected jurisdictions, reinforcing arguments that the measure would constrain funding for infrastructure and programs. The proposition reached the November 2026 ballot via a June 2026 legislative agreement, yet polling trends and historical voter resistance to tightening initiative tax rules beyond existing supermajority requirements for government-referred measures have sustained the 65% implied probability of rejection. No major endorsements or recent developments have altered this positioning ahead of the election.