You're really kidding yourself if you think these numbers are going to stick.
I didn't say they were going to, or even likely to. I would be foolish to completely rule out the possibility, but I acknowledge this is a bump.
If it isn't going to stick, then isn't it reasonable to say Obama is up 12 now and would win in the end by 5-6 points?
Look at all the other state polls we've got the last few days. With a few notable exception, they all show a big lurch to one side. The mid-point has shifted. Pennsylvania has always been lean Democratic, all else being equal, and if the country moves to lean/likely Democratic for the time being that makes 12 points reasonable.
This country is really, really ready for change, and if enough people think Obama is credible, he can reap big rewards. The "if" was always the problem.
Again, this is now, when Obama's having a bump from winning the nomination. I recognize there will be more shifts in the future.