I do.  I should have made it clear that I was talking about San Francisco itself, not the rest of California.  I also have several friends and relatives (my sister-in-law works for the State) who have their finger on the pulse of the community.  Note that I did not say "majority of people", I merely said "large percentage".  That is, of course, subjective.  However, I do not have to know every one of the people in the City to understand the City leans very far left.