Round 2

Obama Vs. Romney: The Presidential Candidates Set For Round 2 : The Two-Way : NPR

I think the best the President can hope for is to stanch the tide of movement to Romney.  It is unclear how much he can persuade undecided voters he is the better choice.  With the issues more complex than the general public likes to deal with it will be difficult to point out the nuance of his positions while the simplicity, though unsupported, of Romney's positions will be attractive.