After he retired, before he announced his candidacy, at
this site. That should help with Clark.
I know it is long, but the testimony he gave before Congress in September 2002 is very important, from start to finish. He keeps trying to leave to catch his plane; I think just after he leaves, Perle confirms that Clark did not support using force against Iraq. You can find this part excerpted at
factcheck.org. He also describes exactly what has happened in Iraq since in his discussion of why we need to be prepared to win the peace. All of this on the record in front of the House Armed Services Committee, before the vote on the IWR. He has not changed his opinion since; he has been misquoted, and at times has stumbled over his words, but his opinion has never changed. The same view is given in his book, "Winning Modern Wars", which came out August/September 2003.