Tuesday’s gubernatorial debate at Pomona College was a good fight — and an enlightening one.  This time, there were eight candidates onstage , which probably will not help Democrats consolidate their vote. It did, however, lead to substantive exchanges over policy.  The most memorable candidate was Riverside County Sheriff Chad Bianco. He was combative, but also knowledgeable on policy. None of the Democrats in particular stood out, though Katie Porter had her best performance yet. Matt Mahan also did well, especially towards the end. CBS News should be credited for holding a lively and successful event. However, the moderators almost derailed it with aggressive “fact checks” and by interjecting their own opinions. The candidates saved the day. Tom Steyer, Steve Hilton and Chad Bianco participate in the California gubernatorial debate.…