Obama seems to be suffering from battered woman syndrome. Battered woman syndrome, for the non-lawyers in the crowd, is a legal defense used by women who commit crimes; they claim that they've been hit over and over again by a man, which forced them to snap. Obama has come under heavy criticism so often that he's reacting to even the mildest criticism with disproportionate anger and emotion.
The unflappable man seems more and more flappable. He's aged visibly since his inauguration. He's been unable to quit smoking. He seems less apt to move off script, more apt to skip, like a broken record, back to comfortable grooves.
Obama has always held the wrong principles. But he, personally, was supposed to be the epitome of cool. Now he's rattled, and he's acting like it. Hopefully, we can retire him sooner rather than later, so he can receive the tender loving care he so richly needs.