The narrower the margin, the more determinative causes for an outcome. For instance, Gore might have won Florida if he would have skipped lunch on Nov 2. The margin in 2016 was also paper thin.Why are you singling them out. Over 90% of Bernie supporters voted Hilary Clinton in the election, a good 20% higher than Clinton voters who supported Obama in 2008.
I have higher standards for people who should know better. Conversely, I don't expect a lot from dim-witted cultists and/or fundamentalist nutjobs.
It was obvious that Trump was an existential threat to democracy. Too many people who should have known better ... did not.
I don't quarrel much with your blame assignment. I would add Clinton's considerable baggage, some of which was earned and some not.
It's possible that 2020 will also be a narrow margin.
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