The video starts at 9 minutes, at about 9:08, you hear someone in the audience shout something that sounds like "String him up".
Newt: ...Just think about how radical he would be in a second term.
Audience: No more years!
Newt: So I have a proposal (interrupted)
Audience: No more years!
Audience: String him up!
The worst part of all is that this kind of ugliness from Republicans doesn't even surprise me anymore. Even worse, however, is imagining how bad they'll be when Obama wins a second term. The lunatic fringe is now GOP mainstream, and they're only going to get worse.