It makes sense for Obama to hit Silicon Valley hard. They are safe Democrat seats, unlikely to flip no matter what Obama does. With lots of dough that can easily convert into tax Revenue for Obama to spend.
He could crap on their front lawn and they would still vote for him. He would therefore be foolish not to tax them to the max.
I think that the Democrats should tax the Hollywood elites at 50% of their income! Yea watch those liberals howl!