What business leaders are saying — and doing — about California's proposed billionaire tax

Jensen Huang, Mark Cuban, and Sergey Brin have all commented on California's wealth tax proposal. Tomohiro Ohsumi/Getty Images; Peter Joneleit/Icon Sportswire via Getty Images; Phillip Faraone/VF25/Getty Images for Vanity Fair Wealthy business leaders have come out for and against the California wealth tax proposal. State labor groups proposed a 5% tax on California residents with assets exceeding $1 billion. Mark Cuban said that only "idiot startup founders" will stay in California if it…