Unfortunately, the 'deplorables' outnumbered the 'politically correct' in too many States.  

After 30-40 years in politics, she should have understood the Electoral College requirements.

And she wasn't smart enough to hire a campaign manager who wouldn't shoot her in the foot multiple times.  

Then there was her arrogant belief that she had been anointed to serve.   

The DNC and the pollsters and the media all helped her believe that, of course.