I think Kathleen Parker may be the one so far who has most accurately identified what just happened and why. 

A Clinton vote was "give me more of the same".   Bernie identified one end of the spectrum against that idea and Trump doubled down on Bernie's anti-Wall Street message and threw in some from the other end of the spectrum.  NAFTA, TPP and the rustbelt.  

Coupled with over 30 years of Clinton history in Arkansas, Washington D.C., impeachment, Monika, Filegate, etc. etc. it was just too much.