your choice as a citizen voter is, there's really only two teams on the field, no matter your third-party dreams. next best hope is to knock the next weakest player off the field.
AND "NOT VOTING" - IS SURRENDER.
If you limit yourself to the two main parties, you have surrendered even more. You are legitimizing the system as a whole by casting your vote, and you are legitimizing the actions of the major parties by giving it to one of them. Vote for a third party or don't vote at all. By reinforcing the idea that you should only go D or R, you are part of the problem.