If a candidate, such as Harry Browne, is influential enough to raise this issue, he's influential enough to stand a chance of winning. Plug in your favorites. Ultimately, it's pointless to try to affect the outcome of an election by playing a bad candidate against a worse one. Your vote simply doesn't have that kind of effect. Even if it did, you would still end up with someone you didn't want.
Voting is a way of conveying information.
A vote for a candidate announces that you prefer that candidate and support his positions. If you vote for one candidate merely to keep another one out of office, you're doing just as much for that candidate as his most enthusiastic supporter. A vote is a vote. Even if the candidates wanted to accomodate you, there's nothing in your vote that makes your views clear. If you vote for the lesser of two evils, you ensure that what you consider evil will continue to win.