A Democrat has finally climbed to the top of the California governor’s race, according to a new poll. Xavier Becerra beat out the crowded field in a new Emerson College poll, earning 19% support from voters and besting Republican frontrunner Steve Hilton and Democratic billionaire Tom Steyer. Xavier Becerra beat out the crowded field in a new Emerson College poll. REUTERS Hilton and Steyer both trailed Becerra with 17% support, with Republican Chad Bianco at 11% and Democrat Katie Porter at 10%. “Xavier Becerra tops the crowded California primary for the first time in an Emerson poll, his support increased by nine points since mid-April, driven by now being the top choice among Democratic voters at 31%,” said Spencer Kimball, executive director of Emerson College Polling. Hilton had been leading the pack since early January.…