Or they switched and voted Trump after the DNC leaks revealed just how corrupt they rigged it for Clinton. It's not necessarily their fault for choosing her, since Bernie wasn't even a Democrat until he ran for president, but they had no sense to tell the tides were in favor of his ideals for their party. Similarly this happened with the Republicans and Trump. They weren't going to allow him to continue gaining traction and were throwing EVERY possibility at him to try to ruin him. They even considered throwing Romney back in the ring. But once it was clear the voters wanted Trump, they bent the knee and gave him their full (mostly) support.
I also think it's asinine to continue doubting Trump's appeal or support base. I keep seeing goofy things like "xd Orange man is failing already he can't win again" which just shows how out of touch people are outside of their bubbles. Trump was massively popular and especially where it counted. Pennslyvania, Ohio, Wisconsin, and the many other states that went Red this election proved that locking yourself inside a liberal echo chamber is completely pointless. I repeatedly said this through the primaries. Hillary refused to even campaign in these critical swing states because she was so deluded into thinking she had it on lock.
I also notice a lot of liberals refusing to debate or engage in healthy discussion about the election, Trump, or the various issues of the campaign. If you disagree with BLM, they call you a racist. If you want to protect the border, they call you a xenophobe. If you feel abortion is wrong, they call you a sexist. The problem with each of these is it devalues and ostracizes people (I'm not referring to people who are equally as bigoted on these topics. Common and decent people have these views and don't hold radical ideas on them) and this was a big tactic from the left in the election. There was a big refusal to engage in conversation or healthy dialogue about issues and it left many people feeling abandoned by the left if they felt differently or completely alienated by them otherwise. Trump was similarly called a racist and a bigot and a sexist and people saw him saying things that made sense to them (protect borders, protect all US citizens, make the country great) and saw a leader they could both identify with and feel represented the downtrodden despite his elite life.
This election and the events around it will be an amazing thing to dissect in the future and see how history shapes the narrative of events of this term.