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There’s no meaningful popular vote in a primary/caucus process. All of the available data suggests Sanders would have not only beaten Trump by would have done so by a major rout. One can never say with certainty that would have happened but there’s a great deal of relevant data and that’s the conclusion to which it points. Anyone asserting Trump would have likely beaten Sanders, on the other hand, does so not only without any actual facts but in direct contradiction of all of the available facts.