You misdirect with your premise. In this race you have Evil and Less Evil.
Some folks get confused by this. They know from reading their Bible that no man is perfect, not a one. So they understand that every vote is among imperfect individuals.
So how can anyone know when our least-imperfect choice is still a legitimate choice, and when our least-imperfect choice is in fact "evil" and therefore is not a legitimate choice?
Easy!
Just listen to and obey the dogma as decreed by the self-appointed Free Republic College of Conservative Cardinals (formerly known as the FR He-Man Mitt Hates Club).
Do whatever "they" say (whoever "they" are, it's never quite clear) and you are officially "pro-God, pro-life, pro-family, pro-Constitution, pro-Bill of Rights, pro-gun, pro-limited government, pro-private property rights, pro-limited taxes, pro-capitalism, pro-national defense, pro-freedom, and-pro America."
Violate their edicts and you are a condemned-to-hell supporter of "liberalism, socialism, fascism, pacifism, totalitarianism, anarchism, government enforced atheism, abortionism, feminism, homosexualism, racism, wacko environmentalism, judicial activism, etc."
But whichever path you choose, pure glorious righteousness or eternal ignoble damnation, be sure to stop by the fundraising thread and pony up. Thank you.