This question that Bernie poses comes up in every American election, and the answer is invariably "no". Even in the record year of 2018, turnout for 18-29 year olds was an appalling 36%.pic.twitter.com/VwaxfiSLJv
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It was about an even split, wasn't it? Which by McGovern standards is one of his best demographics.
But your point about age polarization is absolutely correct, and a weird feature of our era.