What if his term isn't as great as he's built it up to be, and he actually has to play defense?
Well, where he got more than the national average-
At any rate...these are the "swing states" coming into 2012-
He first needs to worry about preventing big Republican gains in 2010.
Basically.
2010 is the class that got re-elected on Bush's coattails in 2004. The Dems could likely gain seats, especially Martinez and Bunning.
I sense 2012 as the first time the GOP start gaining seats back, Obama better hope its not like a "GOP Revolution". Though a pro-GOP swing in 2010 could prevent the above mentioned 2 from losing in 2010.
Even if Obama does well, he will have to worry about 2014.