The newest poll in California on Proposition 8, which would ban gay marriage, shows 52% opposing it, 44% supporting and 4% undecided. But the polling on this has varied a bunch.
UPDATE: It seems it's a bit more complicated. There was a different poll, released the same day, with 'yes' having 48% and 'no' having 45%. Hmm. Nate Stell has the rundown on the polling on the matter; he does think the 'no' side has a better shot at winning.