California voters are split over Proposition 40, a Nov. 3 ballot measure that would impose a one-time 5% tax on the assets of billionaires who resided in the state as of Jan. 1, with some exceptions, to help fund healthcare programs. A UC Berkeley’s Institute of Governmental Studies poll co-sponsored by The Times found 48% of likely voters support the proposal, 41% oppose it and 11% are undecided, leaving it short of the 50% support level that poll director Mark DiCamillo said is usually desirable for ballot measures because undecided voters often break against them. The measure, backed by a healthcare workers’ union after what it says are an estimated $100 billion in federal healthcare cuts approved by Trump and congressional Republicans, has exposed divisions among Democrats. Gov. Gavin Newsom and other critics warn it could drive wealthy residents out of California and hurt a budget that depends heavily on top earners, while the California Democratic Party and Sen. Bernie Sanders support it. The poll also found limited voter awareness of Propositions 41 and 42, rival measures that could block the wealth tax from taking effect if Proposition 40 passes but either of the countermeasures wins more votes. Proposition 41 drew 35% support and 37% opposition, while Proposition 42 was backed by 40% and opposed by 37%, with about one in four voters undecided on each. Separately, Proposition 39, a Republican-backed voter ID measure requiring government-issued identification for in-person voting and additional verification for mail ballots, is opposed by just over half of likely voters, while 42% support it. The survey highlights sharp partisan divides on the voting proposal and more varied splits on the wealth tax, where younger voters, minorities, women, lower-income voters and union households are more supportive than seniors, white voters, men, higher earners and non-union families.