Do you live in a swing state? If not, that is if you live in a solid blue or red state, then you've got a little more choice beyond the "lesser of two evils." Your vote won't make a difference who wins, so why not voice your support for a third party? When third party candidates get a lot of votes it sends a pretty strong message to the two dominant parties, because they might get your vote next time if they change their policies. You're danging a carrot in front of their nose rather than giving it to them because you hate them less. Am I making any sense?
I wholeheartedly agree, and it sucks that more people don't adopt this attitude. My family and I live in Illinois (consistently Democrat due to Chicago), and even they consider voting third party as throwing away their vote, it's frustrating. They even voiced that opinion when I voted Libertarian in the mid-term election solely because I wanted them to overcome the shit the election committee pulls with getting on the ballot.