Sen. Bernie Sanders and Rep. Ro Khanna are heading to California to rally Saturday in support of an initiative that would place a one-time, 5% tax on the wealth of billionaires in the state. ↧ Top Democrats battle over California's proposed billionaire tax Sen. Bernie Sanders and Rep. Ro Khanna will rally in support of an initiative that would place a one-time 5% tax on the wealth of billionaires in the state.