Most developed nations have multiple political parties, not just two. Protecting voters against the “wasted third-party vote” syndrome could be accomplished with ranked choice voting. See Fair Vote, the non-profit organization that is leading the charge to pass RCV nationally.
With ranked choice voting, if your first choice doesn’t win, your vote goes to your second choice; if your second choice doesn’t win, your vote goes to your third choice.
See how ranked voting works at DemoChoice.org
directdemocracyus.org 
John says, “What if we could have a negative vote? We could vote against a candidate we didn’t like. It wouldn’t be an affirmation for the other main party. If this were to happen, Trump and Clinton would have negative numbers. Johnson or Stein would be in the WH with 5% of the vote.”
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