He is aligned with CodePink, who graciously gave $600,000 to Fallujah's terrorists. He is helping the enemy, even if he doesn't believe it.
Here is a good timeline of his comments & views on Iraq: http://gatewaypundit.blogspot.com/2005/11/representative-murtha-truth-or.html He was saying Iraq was "unwinnable" at least as early as 2004... He is a doofus.