There’s a 4th theory/argument: if enough people vote for a particular 3rd-party candidate, that…
Joe Goldberg
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It’s legit and he left it out on purpose.
It wouldn’t fit the subtext of his argument, which is an attempt to make those that vote third-party feel guilty or ineffective or — in a bizarre twist — blinded by their ego.
Check out Benjamin T. Awesome’s like-minded comment. I think his response is really the definitive response to this argument.