I always considered the possibility that Novak was telling the truth that his first contact was not "partisan." If he lied about that, and the source came to fore, and he was partisan, Novak would look worse than he already does.
Here's Novak:
http://www.townhall.com/columnists/robertnovak/rn20031001.shtml
"...During a long conversation with a senior administration official, I asked why Wilson was assigned the mission to Niger. He said Wilson had been sent by the CIA's counterproliferation section at the suggestion of one of its employees, his wife. It was an offhand revelation from this official, who is no partisan gunslinger. When I called another official for confirmation, he said: "Oh, you know about it." The published report that somebody in the White House failed to plant this story with six reporters and finally found me as a willing pawn is simply untrue. ..."
Certainly Richard Clarke could have fit the non-partisan description. At least then, maybe not anymore.