I'll be more than happy to respond to that if you cite or source him going off the handle at the Bush administration on anything other than immigration prior to his ongoing conversion to (as the John Birch Society called it) paleoconservatism. I remember him and Pat Buchanan (who are still close confidants, by the way) debating this during his stint on CNN, with Beck on the pro-Bush side (he has since turned over a new leaf on Bush, which is especially apparent in Beck's chapter on the Bush presidency in Broke).
Beck used to make his lack of support for Bush very clear, and the Iraq war was one of the top reasons. I used to watch him all the time, but have no idea how to get old CNN video. Buchanan has been consistent about his lack of support for the Iraq war. Buchanan was one of the lone dissenting voices against it before it happened, one of the first to identify the new phenomenon of neoconservatism back in the day, and has always been willing to risk his career speaking out against intervention on behalf of Israel. The paleoconservative position is anti-interventionist. Don't think for a minute that Buchanan trusts Beck enough to consider him a confidant.