The California Nurses Association, representing more than 100,000 nurses and healthcare workers, endorsed Proposition 40, California's proposed billionaire wealth tax, despite opposition from Governor Gavin Newsom and several influential organizations. It follows last weekend's backing from the California Democratic Party, in one of the state's most closely watched ballot fights. Newsom has said a California-only wealth tax could encourage wealthy residents to relocate, arguing instead for national legislation. Why It MattersCalifornia's proposed billionaire wealth tax has become a test of whether voters support using targeted taxes on extreme wealth to fund public services. Supporters say the tax would affect around 200 California billionaires whose combined wealth runs into the trillions of dollars.