aside, the only overtly political 2019 nonfiction book to spend more than a single week at number one, Fox News contributor Mark Levin's. That's a huge number, but also a far cry from 2018's biggest political bestsellers.
If book sales indicate that readers' interest in polital content is flagging, their actual reading habits confirm it: After looking into their 2019-to-date data at my request, the micro-learning app Blinkist has found that the consumption of Politics books across the first half of 2019 was 22% less than what it would have expected, based on annual growth.
Granted, political nonfiction is still selling perfectly well. They're just not selling millions of copies within a couple weeks. That sort of gangbusters performance may well have been limited to 2018.