Start with high-confidence public policy books, then narrow by subgenre or adjacent topics.
Politics Without Politicians
Hélène Landemore
The Battle for the Court
Lawrence Baum, David Klein
Acequia Culture
José A. Rivera
Recoding America
Jennifer Pahlka, Audible Studios
Why Nothing Works
Marc J. Dunkelman
Conscience of a Conservative
Barry M. Goldwater
The Project
David A. Graham, Ari Fliakos