Based on the exit polls in California it seems we could be looking at the very unusual situation of Obama winning white voters and black voters and nonetheless losing the state thanks to Hillary Clinton's large margins among Latinos and Asians. That's kind of an "only in California" dynamic (New Mexico and Hawaii also have unusual ethnic makeups that make something like this possible, but almost no black people live in those states) but it's a very large state and, more to the point, a signpost of how things are changing in America. Time was winning whites and winning blacks was by definition the same thing as winning.