He, along with a lot of other Democrats, gave Bush the AUTHORIZATION to use military force to disarm SH as a last resort, which was IMHO essentially the real mistake that they made (i.e. trusting Bush to use our military responsibly), but that's not exactly saying that he or the rest of the Democrats in Congress were gung-ho about invading Iraq. I'm sure that some were but I don't honestly think that Kerry was. It was really Bush, Cheney, et. al whom were jonesing for war and ultimately made it happen. Had they allowed the UN inspectors to do their jobs and supported their results instead of simply denigrating them at every turn, we might have avoided invading at all and I think that Kerry (and most IWR-voting Democrats) would've been satisfied with that conclusion. 
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