If you want to vote third party then evidently you are so fed up with mainstream American politics and culture that you want nothing to do with it. In that case, why bother with political parties? The theory behind voting for a third party is that somehow it helps a movement that later takes over a major party. I think that much more often, what happens is that there is a movement but it has no party attached. So it seems like a better bet to just help by talking with people, writing stuff, and building organizations.