A new book is triggering Donald Trump’s supporters — but they’re confusing one of the authors of an opinion piece about it with an arch-enemy of the former president. The book, “White Rural Rage: The Threat to American Democracy,” by Washington Post columnist Paul Waldman and University of Maryland professor Tom Schaller, scored a write-up in The Daily Beast by Michael A. Cohen, an MSNBC columnist and publisher of the newsletter, Truth and Consequences. He is not to be confused with Michael D. Cohen, Trump’s former attorney — though it seems much of the MAGA world is doing just that. The book …