"Third Party voting only works in the primaries. This is how it works. Say that the Democrats get 35% of the vote, the Communists get 2% of the vote, the Socialist Worker's Party gets 3% of the vote, the Greens get 6% of the vote, and the Libertarians get 2% of the vote."
Huh? Have you ever voted in the primaries? That isn't how primaries work in America. In America each party votes for it's choice of candidate WITHIN IT'S OWN PARTY, during the primary.
Third party candidates are not welcome on the ballots of either the Republican Primary or Democrat Primary. Perhaps you don't actually live in America?
The Democratic winner of the primary election sees how many ideologues and True Believer losers there are in the fringed Parties, and tailors his or her message accordingly in order to court these self-marginalized voters.