Billionaire climate activist Tom Steyer is selling himself as a class traitor in his bid for California governor. The Democrat says rich people and corporations should pay more in taxes. His advocacy for issues often unpopular with other wealthy people has won him staunch support from some and persistent skepticism from others. Steyer has long used his pocketbook to influence politics and policy in California and beyond. He said that work demonstrates his ability to deliver results for Californians as governor. But governing the nation's most populous state would bring new challenges for someone who's never held public office.