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It is quite easy to show that the net effect of libertarian agitation is to drain supporters from the anti-McCain camp into various quixotic alternative campaigns.
Without commenting as to whether that is true or not -- or that you could "easily" show it is -- that is not the point you made, and to which I replied. You claimed: "all 'Libertarians' are secret McCain supporters." Nary a word about libertarins' voting for "quixotic alternatives" being akin to Naderites.