Though he is rarely mentioned, I think Colin Powell has a share of the blame for the Iraq War.

[DirkGently]

44. He's told Barbara Walters his U.N. testimony was a "blot on his record."

He did not apologize for starting a war or cop to any disingenuousness. He pins the situation on "bad intelligence" and regrets the American people were given the wrong information. Which is not the whole story by a long shot, but which is also miles beyond anything Cheney, et al, who still swear there was proof of a connection between Saddam and 9/11 have said.

You are being a little over-harsh in protesting that you can't imagine Powell showing any "humility and/or contriteness" though. He did and he has.

It was Powell who told the United Nations and the world that Saddam Hussein had weapons of mass destruction and posed an imminent threat. He told Walters that he feels "terrible" about the claims he made in that now-infamous address -- assertions that later proved to be false.

When asked if he feels it has tarnished his reputation, he said, "Of course it will. It's a blot. I'm the one who presented it on behalf of the United States to the world, and [it] will always be a part of my record. It was painful. It's painful now."

He doesn't blame former CIA Director George Tenet for the misleading information he says he pored over for days before delivering his speech; he faults the intelligence system.

http://abcnews.go.com/2020/Politics/story?id=1105979&page=1