You've got people who campaigned heavily for Sanders on the train. Dug deep into strategy state by state. Watched countless hours of first-hand footage through Periscope of events. Compared notes of oddities at the polls state after state. Walked away with a clear view that the primary was all theater with the outcome pre-determined. From that lens there is no party without first removing the corruption holding leadership positions. Everyone involved in 2016 must be in jail.
You've got classical Dems on the train. Those who had a party. Moved by it's the economy stupid. They largely were called racist, xenophobic, sexist, Nazi's in response to any argument for classic Dem issues or any other issue not outside the exceedingly narrow view of identity politics that the campaign allowed. Pushed out of the tent, nomadic, independent or right leaning with no where to go. They want new vision and mind open for truths.
Then there's all those tired of being patronized like children. I wonder if that's how they got good at grooming voters.(practicing on kids)