I like the .GIF but it doesn't really capture the essense of the moment. It looks like he is just disagreeing with him.
The look of Ron Paul was like "Hey, you don't wanna go there because I'll knock your ass out" then McCain had to be saved by the CNN host by pretending the most interesting part of the night will be discussed later on.
This guy gives the Asian man the same look just before he knocks him out...