Why is American politics so intense and emotionally competitive today, and how did we get here? In The Fundamental Voter, John H. Aldrich, Suhyen Bae, and Bailey K. Sanders explain why the notion that we are divided into tribal loyalties is, at best, only partially correct, and discuss how the divisions rest on much more substantive politics than they once did. In the 1950s and 1960s, the American public based voting primarily on partisan loyalties. Landslide presidential election...