This was a result of voters wanting change from the incumbent administration - just like Labour's victory here was. It almost doesn't matter which political shade the challenger is - and in the case of the USA what his charater was. People are fed up - and want to believe what they are told. Whether this is blatant fabrication; unsustainable on analysis or simply soundbites does not matter. We saw this with the Brexit vote.
That said, the democrats in the US, and even Labour here to a degree have become an intellectual elite; rooted in the past/the establishment and unable to see beyond their own political bubble. Voters think that disruptors who speak plainly are the route out of the malaise we are seeing with Western democracy. It's obvious that many politicians have lost the ability to understand the public mood...Trump's talent is that he understands this much better than anyone else.