Well, voting for third-party candidates is not going to really get them elected because of the first-past-the-post voting system in place. There's something called the "spoiler effect" that just ends up securing the two mainstream parties in place. This video explains it rather well. http://www.youtube.com/watch?v=s7tWHJfhiyo

I'm still voting third-party on principle, even though I know it'll do absolutely nothing.