Oh, he should totally face a primary challenger. There will be nothing like win after win after trouncing after convincing trouncing, week after week, month after month to give him good visuals. In fact, the primary will be so lopsided in the first few states, I'm sure many will blame him for being a bully.
I like the visual:
Iowa - Obama 95% of the vote vs. Challenger 5% of the vote
But that will totally convince him he needs to move to the "left", I suppose.
In short and this is very short, a primary challenge will do nothing but assure The President a string of landslide victories before the primary election, IMO.
I'm all for that visual heading into the General Election.