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Think about it. It would attract the support of people who would otherwise vote Democrat, not people who would otherwise vote Republican. You are blinded by your own ideological fantasies if you think it would attract people who would otherwise vote for McCain - look at what Michelle Malkin's crew say about him and his ACLU buddies:
http://michellemalkin.com/2008/05/12/the-bob-barr-candidacy/