I'm still having a hard time envisioning Obama getting anything over 280 EV's. I do think and hope he'll win, but I am far from certain. If he does win, he will have absolutely no political capital to spend unlike the little Bush had in 2004 or especially after Clinton had in 1996. He will be a lame duck from the day he starts his second term.
Look at it this way: he won in a landslide in 2008, and McConnell and Boehner have basically been given a free pass to just table everything he wants to do. The upside is that if Obama wins re-election, the GOP will have failed badly in their only objective: to unseat Obama. Not fix unemployment, not fix the economy, just unseat the President. If Obama wins and Ds hold the Senate I think they'll have to deal with him at least a little bit.