Some home truths: a tough, long primary battle will take the sting out of the powerful backlash that he [Obama] is the function of a fad of euphoria, marketing hype, or gas-baggery. It will take the edge off the criticism that he is untested. It will help him prove his mettle and endurance. ~Andrew Sullivan 
Alternatively, the next five weeks will vindicate all of these assumptions and drive home just how media-driven and imaginary the entire phenomenon has been.