I'm not surprised that Davis trails everywhere but in the SF Bay Area. The Bay Area (where I was born and raised) would vote for Joseph Stalin if he were pro-gay and pro-abortion.
I currently live in San Francisco and let me assure you that people here would vote for Stalin even if he wasn't for gay rights and abortion!
POS has also done polls for the Coleman camp in MN and Thune camp in SD. It seems to be an exclusive GOP firm. But there's another poll out recently showing a marginal Simon lead as well. Bump for Bill!