My main reason for making this prediction was: 1) the notoriously fraudulent business of political "polling" which at the time was predicting a Hillary Clinton landslide; and 2) Trump's stupendous popularity at campaign rallies all across the country.

For months I had been watching entirely online scenes of 70,000 people or more gathering at some large convention center to hear a Trump campaign speech.  There was virtually none – none! – of this on any network television since all of the networks except for FOX are the propaganda arms of the Democrat National Committee.  At the same time there were short snippets online and on television of Hillary Clinton "rallies." Some of them showed dark, almost empty rooms at a hotel somewhere with maybe 200 people, most of whom were probably DNC plants.  She did hold larger choreographed rallies, of course, but these almost-empty ones spoke volumes about her "popularity."  She also did not help herself by labeling 65 million voters as "deplorable" racists, sexists, homophobes, etc. to a televised laughing and jeering crowd of Democrat supporters.  This is what convinced me that Trump was going to win, and shock just about everyone.