Well, CA is third highest in the nation - $0.08/gallon more than the national average and $0.10 more than my state. That explains at least some of it.
But, the real reason it's that price is because that's the market clearing price right now in CA. If demand does not sufficiently fall to motivate a decrease in price, then why should we be surprised that (insert entity here) charges what they charge for Gasonline - even if it seems too high. Assuming they (the oil companies or whatever) are motivated by profit, why would they lower price when demand remains high at the current price?
Personally, I'm kind of happy that the cost of gasoline is this high. The reason is that this is the only mechanism by which real change can come via more fuel efficient and less polluting vehicles. I trust the market to mandate hydrogen cars (or whatever perceived fossil fuel replacement panacea) more than I do legislation.
The price of gasoline, to me, is like so many other things in life. It sucks - I have to deal with it - and if I dwell on it, I'll just get angry. So, I just accept that it's reality and go on with my life.