I thought the same thing when I watched him. Right at the end, when he said (to the effect) that they are sticking to their story and no evidence has been presented thus far to refute it. It was the way he looked into the camera, as though he were telling his cocktail party friends and his handlers at the DNC that this was the plan.
As an aside - I have not had CBS News on in my house for at least ten years. I was kinda surprised at how awful he looked. Besides the sore throat from probably screaming all day - he just looked washed up. Definitely not the guy who my parents used to watch.
Hmm, sounds similar to the speculation that the Al-Qaida leader whose tape was just released might have been trying to send a secret message to his supporters!