I don't support either one of the two debaters. My view is that the debates are little better than theatre for consumption of the masses. Having now seen a video recording of the full debate it's hard to relate what I saw to what has been said and written about it. If I had to score it I'd say it was a tie rather than the resounding win for Romney most have been calling it, along with a variety of theories as to whether it could have been a deliberate ploy by the President and his advisers, or was he even "taking a dive"? Dearie me!
Romney was on the offensive, naturally, why wouldn't he be, Obama already has the ball? That was to be expected. I didn't see Obama as tired or disengaged. He did look at Romney, in between quickly writing notes, didn't seem at all intimidated as some have implied. I don't agree with either of 'em, so watched the proceedings with a different perspective from most, I guess.
What seems likely to my way of thinking, is that immediate post mortems by TV pundits (of which I haven't seen any at all) must have shaped the views of many. It was in the best interest of those pundits to keep interest in the debates and campaigns alive for as long as possible, leaving viewers and readers panting for more, with plenty to argue about until the next outing.