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The comparison between Clinton and Bush is reasonable in the sense that they both rather brutally dealt with Iraq on relatively weak premises.
It is absolutely correct that it is logically invalid to use the premise of Clinton's cavalier foreign policiy to reach the conclusion that Bush's cowboy foreign policy is somehow justified. This much is obvious to anyone who knows how to contstuct an argument.
I was just pointing out that Groenhagen's crucifying of Clinton is not the blow to the left that he seems to think it is.