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Swing voters don't exist. Or, at least, they don't exist in numbers that are significant enough to influence elections above other factors. Swing voters win elections which is why being a big centrist who appeals to nobody is super important is nothing but received wisdom, and is pretty much the principle reason why Hillary Clinton got beaten by a man with holes in his brain.
What matters is who can motivate their voters and get them to the polls. Red meat for the base. I.e. #berniewouldvewon
And (rightly or wrongly) turn off the swing voters / purple states presumably?