How do you know which ones are La Jolla? I "knew" because I looked at the precinct sheets for the precincts labeled "La Jolla," downloaded from the San Diego County registrar's website
Yes, I just eyeballed it, but it looked more like say 52-48 Obama to me.
Click on the enlarged map and click on the precincts. I think there are about 18 or so, including 9 or 10 in a tight circle which Romney won. There are some Obama precincts on the coast itself and further south closer to Pacific Beach, which look like the hipsters and surfers.
San Diego City is 40% D 27% R by registration. The state as a whole is 44% D 29% R.