Jack and John : ) are actually friends. I wouldn't expect him to attack him. On the other hand, I would expect him to attack Cheney/Bush.
But they should of appeared on a different show, that show is for constructive criticism, but John Edwards showed the same he showed the same lack of criticm that he showed Kemp that he showed Cheney and it cost us the debate and the election, and he was too nice to Cheney like Lieberman was.