California's superdelegates – especially its Democratic members of Congress – are caught up in the rising angst. Six of the fifteen congressional members who have endorsed Clinton saw their districts vote for Obama on Feb. 5, while five of the seven who have endorsed Obama have voters who favored Clinton.
I wouldn't want to be one of those eleven members of Congress whose prior endorsement was contradicted by his/her district's subsequent vote. Read the whole thing, it is brief but good.