"Mr. Russert could not remember the exact details of his telephone exchange with Mr. Libby, like the time of day. A defense lawyer read an F.B.I. report where
Mr. Russert said that he could not rule out discussing Ms. Wilson with Mr. Libby, but had no recollection of it. Mr. Russert said he did not believe he said that.
Andrea Mitchell of NBC said on Oct. 2003 that the identity of Ms. Wilson was "widely known among those of us who cover the intelligence community." She later said that she had been wrong to say that. The defense suggested that if Ms. Mitchell had long known of Ms. Wilson, then Mr. Russert, then her boss, must have long known it too."
http://www.nytimes.com/ref/washington/LIBBYDIARY.html
So early on----Russert was not so sure and said so to an FBI agent while being questioned----but he BECAME SURE later on.
In NO WAY should there have been a conviction here on ANY count And I've lost a lot of respect for Tim Russert and his motives here.