This should be one of Sanders' best larger states. Troubling news for him.
Why is that? Sanders has not shown any traction with Hispanics. Does CA have one of the higher percentages of white voters in a Dem primary outside the South? If so, you have a point. Granted, CA probably has among white voters in a Dem primary, an unusually high percentage of white gentry voters, which are his base. Odd for a Socialist, but that is the way it seems to be. Maybe they are comforted that a Pub Congress will prevent Sanders from taking their money away, in a manner that they will not like.
http://www.cnn.com/ELECTION/2008/primaries/results/epolls/#CADEM on the fourth page. This is the best data I could find on the race for the Democratic Primary in California.
White: 52%
African-American: 7%
Latino: 30%
Asian: 8%
Other: 3%