If there were a Dem willing to run against Obama I think we may have heard rumblings by now. After all, the GOP hopefuls are circling and raising money incl. Gingrich, Huckabee, Romney and Palin (all losers from the last cycle). His poll numbers are up right now and he's done a lot of the things he campaigned on in 07-08. BHO may run unopposed.
Noone with in the dem party is going to challenge him. There was speculation that Hillary was going to but I dont think that holds water anymore. It appears that BO's number are getting better. The economy possibly on verge of some improvement, and the fact that the Repubs have the house floor for the next 2 years, and also the way BO handled the Tucson tragedy is working on his favor. If he continues as he started 2011 he will secure the 2nd term.
They'll find someone last minute like they did Palin. Those fucks will do anything to just make things difficult just so they can have a platform to take more shots at "liberal" programs.
This perception of black men being incompetent is nothing but the same stereotype of inferiority that has been circulating since the days of slavery. Think of it as putting old wine into new bottles.