The Birth of a Controversial Measure
What began as a desperate response to federal healthcare cuts has evolved into California’s most expensive ballot measure fight in history. When Donald Trump signed the One Big Beautiful Bill Act earlier this year, cutting over a trillion dollars from Medicaid and the Affordable Care Act, union leader Dave Regan saw an opportunity. “That’s why we were willing to do something that lots of people said was crazy,” Regan explained to The Update Desk. “To us, what’s crazy is doing nothing and watching millions of people lose coverage.”
The solution emerged from Regan’s healthcare union, SEIU-United Healthcare Workers West, as Proposition 40 – a one-time 5% tax on California’s billionaires as of January 2026. The proposal aims to fund healthcare programmes, alongside education and food assistance initiatives. Yet what seemed like a straightforward solution quickly transformed into a David versus Goliath battle, with the state’s ultra-wealthy mobilising unprecedented resources against the measure.
Silicon Valley’s Million-Dollar Counteroffensive
Tech billionaires have treated the proposal as an existential threat, reportedly investing upwards of $356 million into independent expenditure-only political action committees to defeat it. In the first two weeks of October alone, opposition campaigns spent more than $42.8 million – surpassing $2.5 million per day. This financial firepower has funded an army of consultants tasked with lobbying politicians, saturating airwaves with advertisements, and placing op-eds in Latino newspapers across the state.
The opposition’s strategy extended beyond mere campaign spending. According to leaked Signal group chats, tech executives including Sergey Brin, Marc Andreessen and Max Levchin discussed various tactics to undermine the initiative. One participant reportedly suggested: “If there’s an impediment, just buy it.” This approach reportedly included attempts to purchase the signature-gathering firm Kimball Petition Management, whose president Fred Kimball confirmed receiving inquiries about a potential sale, though he ultimately declined, stating, “Once you do that, it’s all over… My dad started this industry, there’s no way I’d do that.”
Political Maneuvering and Unexpected Endorsements
Governor Gavin Newsom found himself caught in the crossfire, initially opposing the billionaire tax while maintaining relationships with its most vocal critics. Reports suggest Brin personally confronted Newsom at a private gathering, allegedly telling him the tax was “forcing me to leave California.” While some ultra-wealthy individuals have indeed departed – including Brin, who purchased a $42 million mansion in Nevada – the vast majority have remained, with Nvidia CEO Jensen Huang declaring he’s “perfectly fine” with the tax.
The political landscape shifted dramatically in August when the California Democratic party unexpectedly endorsed Proposition 40 after Congresswoman Maxine Waters publicly criticised her colleagues for the initial rejection. This endorsement came despite opposition campaigns having donated tens of thousands of dollars to various Democratic organisations. The California Federation of Labor Unions AFL-CIO also threw its considerable weight behind the measure, with president Lorena Gonzalez describing the moment when union healthcare workers stood to advocate for hospital funding: “Once you heard that, and heard that billionaires got tax breaks from the big BS bill and that Medi-Cal got cut, it just became a no-brainer.”
The Battle for Voter Hearts and Minds
With midterm elections approaching, both sides have resorted to increasingly aggressive tactics. The opposition launched an ad campaign branding Prop 40 as a “dangerous wealth tax” and “reckless experiment,” securing endorsements from prominent Democrats including Xavier Becerra and Daniel Lurie. Meanwhile, the pro-Prop 40 campaign has mobilised celebrities like Mark Ruffalo and Shepard Fairey, alongside viral social media campaigns.
Former Congresswoman Katie Porter, a known corporate critic, has unexpectedly joined the opposition, writing op-eds and appearing in campaign materials arguing the measure fails to address systemic healthcare issues. This shift has further complicated the Democratic divide, with some party members accusing others of being too beholden to billionaire interests. The controversy has also reignited questions about SEIU-UHW president Dave Regan’s leadership, with former executive director Courtni Pugh alleging physical assault in 2009 – allegations the union investigated and found substantiated, though Regan maintains they’re retaliatory.
Why it Matters
This battle represents more than a single ballot measure – it’s a harbinger of wealth inequality debates sweeping across America. The unprecedented spending by tech billionaires reflects deep anxieties about wealth taxation spreading beyond California’s borders. As Nobel Prize-winning economists note, the combined wealth of California’s billionaires ($2.3 trillion) equals the state’s entire annual income from all taxpayers. Their opposition campaign’s success in driving up signature collection costs and mobilising national attention demonstrates how wealth concentration enables political influence on an unprecedented scale. Regardless of November’s outcome, Proposition 40 has already succeeded in forcing a national conversation about whether democratic societies can effectively address extreme wealth disparities without risking capital flight. The fight’s intensity suggests similar battles may soon engulf other states contemplating wealth-based taxation.