Well, I am not a Romney supporter but I am a little surprised that you thought he did so poorly. Presidential may have been the wrong word for me to use to describe him -since Romney does comes across as a bit superficial. However, I certainly thought he did well in the debate: particularily with his joke about being afraid that the Gov. of Michigan would tax the debate.
To me, Romney comes across with all the sincerity of Hillary Clinton, but without her charm. ;>)