David Gergen, CNN
Before the first presidential debate, voters were telling CNN by nearly a 2-1 margin that they expected an Obama victory. Many commentators were ready to hold a coronation for the president. Now, by more than a 2-1 margin, voters who watched the debate are saying that Mitt Romney won it -- and we have a horse race on our hands.Romney was one of the two big surprises of the night. His performance was head and shoulders above anything he has displayed so far. He drove the debate, had a coherent message that focused on jobs, showed a superior command of detail, was empathetic toward people...