In California’s 15th congressional district, which includes the cities of Los Gatos and Cupertino, heart of Silicon Valley. Not much in the way of Obama signs or enthusiasm, but then again nothing for Romney either. District went 68.4% for Obama in 2008 (62.9% for Kerry in 2004, 56.7% for Gore in 2000). It is a lost cause here.
Same area, around Mountain View I have seen more Romney signs than Obama signs (and the signs are staying up, which means no one is motivated to vandalize them). Definite lack of enthusiasm for Obama, and this is the SF Bay area.