Billionaire backing the recent California money politics initiative against Citizens United is good news

San Francisco billionaire Tom Steyer, the nation’s single-largest political donor in the last election, is backing a California initiative designed to get big money out of politics. Mr. Steyer, the former hedge-fund manager who gave $74 million to elect Democrats in 2014, has endorsed California’s Proposition 59, which takes aim at the Supreme Court’s ruling in…