The first step is to get over being startled at the fact that Pat Buchannan is against the War in Iraq. Given his isolationist stance this shouldn't really be a surprise; but so few people anywhere take stands purely on principle anymore, you can't really be blamed.
But once you get over that, actually listen to the guy; he has some interesting geo-political points to make. One place to do to this is the following (second-last segment):
The way he talks about and points out the importance and significance of Baghdad. I have not heard Muslims discuss that aspect. If I may say so, most Muslims are too busy being modern victims of the post-Ottoman period that we live in to own their own history and take in the bigger picture. As I have said before, in a lot of ways we are still living in the period of tying up the loose ends of that empire. More on that later.