If I was an advisor, and McCain should be thrilled that I'm not, I'd tell him to go to NY as well. Stir up the PUMA vote. 
He may do just that - I know he's going to make a stand in New Jersey and New Hampshire along with Pennsylvania. He could win all three.
I agree with freedumb2003 - California has gone blue since 1992, but that wouldn't happen if it weren't for L.A. and the Bay Area. From the rural extreme northern part of the state, those people there were very conservative, the hick vote could swing it back. I don't care if there's more registered Democrats than Republicans in the state, the presidential candidate has won when the gap there was much wider than it is right now. Plus, there's that gay marriage referendum on the ballot that'll smoke out the social conservatives.
Ahhhhhhhhhhhhhhhhhhnold is a RINO, but he's also still very popular and a big McCain supporter.