Who Are Bernie Sanders’ Supporters Voting For?
I haven't seen any numerical numbers, but there were a bunch of die-hard Bernie supporters who learned to hate Hillary so much during the primary campaign that they just couldn't vote for her. It was an entirely emotional reaction for them, and of course, the WikiLeaks revelations didn't help. Some voted for the 3rd party candidates, many didn't vote at all and some voted for Trump. I do recognize that most Bernie supporters voted for Hillary in huge numbers...but just not enough.
Those Bernie supporters who voted for Trump were largely the Rust Belt blue collar workers who identified with Bernie's message on single payer health care, the inequality (millionaires and billionaires) but probably mostly on trade and jobs...the China Syndrome. On that single anti-trade agreement issue Bernie and Trump spoke the same language, so that particular subset of Bernie supporters became essentially single issue voters, preferring Bernie but opting for Trump.
Hillary was bashed so much by Trump and Republicans (with help from the media), she had a hard time getting her message through. I have mentioned this before, but I studied where she stood on all the issues very carefully. Her website, HillaryClinton.com was outstanding in that regard for wonks like me, but I recognize very few people including the media put much effort into reading and studying it like I did. It was frustrating for me.
In the end, people largely voted their emotions, and didn't engage in critical thinking.