Not disputing that, but it tends to be less concentrated the further you get away from the inner slum (er, city) of San Francisco. I live in Walnut Creek, and the 25 mile difference between here and San Francisco is quite amazing.
Yes, we're sorta dominated by the Democrats here, but they are by and large regular people. Tauscher is almost a right-winger compared to the other moonbats you noted.
Have you asked all those seemingly regular people about their actual politics? The saddest thing is the case of Pombo. That is the archetype of what has happened to California and what will happen to the entire nation if action is not taken. We've gone from cowboys to Chomsky readers.
I live in the East Bay, too. While I may not love the prevailing political views around here, I don't like it when our community gets trashed. It's a cheap shot, like saying Dallas values equals favoring assassination or West Virginia values equals incest. SF does not equate to NAMBLA.