This is what Libertarians have been saying for...well, forever.
Ross Perot supporters said that, and now Ron Paul supporters are saying it. Bill Clinton got elected because of this...like him, or not, almost 20% of the Republican vote went to Perot. To my discredit...mine did too.
So, imho...Ron Paul supporters are right now taking away votes from more conservative candidates that have a chance. Candidates like McCain and Huckabee benefit the most. The more people vote for Paul, the more likely someone like McCain has a chance. Again...like it or not, that's just the reality. Paul has no chance, and never has had a chance.
I will vote for a Libertarian leaning candidate when I feel they've garnered enough support to make them truely viable. Until then, I will vote for the most conservative of the candidates that actually have a shot at winning.
The lesser of two evils? Ayup...I will always take lesser evil, over more.