This is why Obama is suddenly attacking Romney on his time at Bain:

A new national telephone survey finds that 51% of Likely U.S. Voters trust Romney more than Obama when it comes the economy, while 39% trust the president more. Ten percent (10%) are undecided. (To see survey question wording, click here.)

And there’s a reason for Obama’s umpteenth pivot to economic issues:

The economy remains well ahead of all other issues in voters’ minds when it comes to how they will vote in November.

Obama’s biggest hurdle is that he can’t run on his record, because his record is abysmal, and people know and feel that. His only possible route to re-election is to paint Romney as somehow worse than he is, and that’s going to be a hard sell given the numbers above.