Obama steadily deteriorated as the debate progressed. His mannerism betrayed his obvious anger and frustration at having anyone challenge him without his ability to cut the person off, as he typically does.
At one point Obama actually was reduced to begging Jim Lehrer to change the subject. Obama's entire demeanor was of a petulant adolescent who was getting a much-needed verbal thrashing and trying his best to smirk his way through the ordeal.
Romney strategically gained the upper hand by refusing to allow Lehrer to stifle his responses, a tactic all the uber-liberal moderators try to impose when their pet candidate's doing poorly. I look for the moderators of the next two debates to double down on their attempts to stifle Romney, given the mainstream media's massive collective psychological investment in Barack Obama.