Democrats most assuredly did NOT overwhelmingly support Clinton - that is the true fact.  

Clinton failed because she deserted the white working class, blue collar worker.  Even her husband told her she was in danger of it...in her arrogance, she chose not to listen.  She was warned by those who saw it coming - 
http://www.motherjones.com/politics/2016/11/rust-belt-democrats-saw-trump-wave-coming

Hillary Clinton is definitely a failed candidate.  She won the popular vote because she decided to concentrate on the big cities and their populations.  That was not enough to carry the country.  And a lot of people saw it coming.   And as I've said before - if an actual likable candidate was running against her?  She would have been trounced in the popular vote, too.