Google cofounder Sergey Brin has spent over $100M to oppose California's billionaire tax. Here's how much he could lose if the proposal is passed

Bernie Sanders and Ro Khanna rally for California Proposition 40 billionaire tax amid Democratic split

Sen. Bernie Sanders and Rep. Ro Khanna are campaigning in California for Proposition 40, a ballot initiative that would impose a one-time 5% wealth tax on the state's approximately 200 billionaires. The measure has divided Democrats, with wealthy tech figures like Google cofounder Sergey Brin spending over $100 million in opposition.