Via Ed Morrissey, the latest PPP survey pits President Obama against five potential Republican challengers. Obama does not fare well:

He trails Mitt Romney 46-43, Mike Huckabee 47-45, Newt Gingrich 46-45, and is even tied with Sarah Palin at 46. The only person tested he leads is Jan Brewer, who doesn’t have particularly high name recognition on the national level at this point. . . .
There are two things driving these strong poll numbers for the Republican candidates. The first is a lead with independents in every match up. Romney leads 48-35 with them, Gingrich is up 50-39, Huckabee has a 46-40 advantage, Palin’s up 47-42, and even Brewer has a 38-37 edge.

More here.