I don't see any evidence presented the Powell knew. Just a vague referance to "mounting evidence".
I often disagree with him and his politics, but I've always thought that he was an honorable man. Especially for someone who ran in such high political and military circles.
This from the NY Times
"On Oct. 1, 2003, Mr. Armitage was up at 4 a.m. for a predawn workout when he read a second article by Mr. Novak in which he described his primary source for his earlier column about Ms. Wilson as “no partisan gunslinger.” Mr. Armitage realized with alarm that that could only be a reference to him, according to people familiar with his role. He waited until Secretary of State Colin L. Powell, an old friend, was awake, then telephoned him. They discussed the matter with the top State Department lawyer, William H. Taft IV. "
I'd say that pretty much nails it that Powel knew.
Your next defense of this traitorous scum would be?