I've never like Colin Powell or his idea that the only war we should fight is one we can win in a week. I always thought he was a Republican only to advance his military career. He leaked a lot of information to damage the Bush Administration. I lost all respect for him during the Valerie Plame affair, where he was willing to stand by and watch the CIA try to damage Bush. Here is an article by Thomas Sowell on this subject:

http://townhall.com/columnists/ThomasSowell/2008/10/31/obama,_powell_and_popularity