Survey USA today 9/15 shows Obama up by 4....
I looked at this poll and it has some very strange internals. They don't list the party breakdowns, but they show McCain tied among men, and only leading by 1 for voters over 50. It also shows no movement of women to McCain.
Unless we start seeing other polls with the same internals, I am pretty comfortable viewing this poll as an outlier, especially without further information on party identification distribution.