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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. If you want to offer a mirror image proposition, you could try saying something about Nader supporters, because the same logic certainly does apply to them. But, I wasn't talking about 'card carrying membership' of anything.
That reminds me, though : I do not understand why they have 'open primaries', in which members of opposing parties can vote to tactically split their opponent's campaigns, as in the recent Limbaugh "operation chaos." Why do these 'open primaries' even exist??
wikipedia offer much argument for it:
http://en.wikipedia.org/wiki/Open_primary