Scary Drumpf

Jacob Weisberg in Slate summarizes succinctly something I've been feeling too:

An America in which Trump can represent one of the major parties feels like a very different country from the one many of us thought we lived in. Like a lot of people, I was much too complacent. It can happen here, and it might.

Here is picture from today's Trump rally, in Florida, covered by Slate, where he (Drumpf) asked people to raise their hand to pledge to vote for him.

How can these people be so blind, so ignorant of history, so absolutely heedless?