He should have called this presser quits 15 minutes ago.
I think he also believes that Libby deliberately made up a "cover story" that he simply told reporters what other reporters told him, in order to evade prosecution for the actual leak. He couldn't prove that to the GJ either. All he could prove was that Libby said one thing and Russert and Cooper said something else. That's enough to get an indictment, but I'm not sure it is enough to get a conviction.