An oft told story tells us, that in the Nixon versus Kennedy debates those who watched on TV gave victory to Kennedy, while those who listened on radio gave victory to Nixon. I had a slightly similar experience of the recent Romney versus Obama debate.
I had not planned to follow the debate, but ended up listening to it on the radio. I thought Romney did well but would not have awarded him the comprehensive win that most others (I presume mostly TV watchers) gave.
In the Nixon versus Kennedy debates we had an obviously telegenic candidate (before that was even a word) and an obviously less telegenic candidate. For the Romney and Obama that is much less obvious. Both candidates count as telegenic.
From the descriptions it sounds as if body language more than simple appearance was decisive. The lesson I take is, that before laughing at the “Spot the Alpha” blog posts popular on Heartiste et al, you should consider just how important things such as posture and attitude can be. If it is important for the President of The United States, it is important for you.