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You can be flippant about the nature of first past the post voting systems if you like but it’s not a useful contribution to the discussion. If you want to be POTUS you run as an R or a D and Bernie is not an R. That does not mean there are not R voters who like his policies.
More than you think. Trump is a fascist piece of shit but he’s not wrong when he says the system is rigged and drastic change is needed. Replace Trump’s Nazi rhetoric and egoism with workable ideas and genuine empathy and in simplistic terms you have Sanders.