From a Glenn Beck interview with Ron Paul:
GLENN: What do you think about the idea that you gotta vote for the lesser of two evils, no matter what side it is, you've got to vote for the lesser of two evils because half a loaf of bread is better than no bread?
CONGRESSMAN PAUL: I think it's one of the dumbest ideas around. I think that that is a real wasted vote because the two parties have blended together and there's not any difference, nothing really ever changes. You elect a conservative Republican and the deficits explode. And you elect the Democrat to change foreign policy and they make the foreign policy worse. So I think if you really want your vote to be counted, you have to take a principle stand and vote for, if you are left leaning, take a stand for one of the alternative candidates who are left leaning. If not, if you tend to be libertarian, vote libertarian or for the constitutional party.