The authors make a persuasive case that what really divides Americans when it comes to politics is not ideological but rather in the way we think. On one side are the Rationalists, who use reason and the scientific method to understand the world. On the other side are the Intuitionists, who use gut feelings as their guide. The intuitionists distrust the press, distrust experts, and embrace conspiracy theories. They argue that Trump won the Republican nomination and the election because the he spoke resonated strongly with Intuitionists.
The weakest part of the book is that way the authors try to frame our political divide as one of Republican Intuitionists against Democratic Rationalists. I see plenty of conservative Rationalists politicians (Romney, Kasich, Flake) and pundits (George Will, David Brooks) and no shortage of "enchanted thinking" on the left (opposition to vaccines, GMOs, free trade). Still, the authors provide a useful lens through which to view the 2020 primaries and election.