Also, take into consideration the Bradley Effect in polls such as these.
I think the Bradley effect has already been proven to be out of play thus far so I don't see any reason why it should suddenly rear its head during the general election. With the exception of New Hampshire there wasn't one state that polled consistently for Obama that he lost. The issue of race has already made its big splash during the primary so unless the legendary "whitey tape" pops up in October I doubt we'll even feel the ripples.
