In the 2016 U.S. Presidential election, roughly 63 million votes, of a population of 325 million, were cast for #45.

That is 19% of the total population. Reliable sources inform me that this may in fact be significantly less than half of all Americans.

The notion of the nutcase fringe in politics has been around for a while -- there's about 20% of the vote you've got to be very aware of. Where other voters are insufficiently motivated, or actively discouraged by various means (voter suppression efforts, media, uninspiring candidates), the fringe can win.

That said, there's a range of types throughout the country, and a worrying fraction are worrying. Or worse.