Bernie Sanders slams Sergey Brin over his $102 million fight against California’s billionaire tax after Brin’s $140 billion wealth surge.

California's Prop 40 would impose a one-time 5% tax on the net worth of the state's billionaires.

Google co-founder Sergey Brin has donated over $100 million to oppose California's proposed billionaire tax, which could cost him an estimated $13.3 billion in payments.