The Framers failed to anticipate universal suffrage and the American two-party system, let alone how these developments would change their system. Instead of letting Congress debate and decide policy, voters can now decide many issues directly. The chapter describes Americans grudging recognition that partisanship can lead to stable, responsible government. It then describes how 20th Century scholars developed rational voter models to formalize these ideas. It also asks how social voting, party leadership, identity politics, candidate charisma, and deep-pocketed donors change these results. Finally, it also argues that the existence of legislative deadlock lets comparatively small minorities take centrist compromises off the table. This forces the party system into presenting extreme choices that most voters oppose. The ensuing standoffs can last for years years and sometimes decades.

This chapter briefly reviews the books main arguments and offers limited reforms to improve the Framers design. The deepest challenges involve the characteristically 21st Century debates over COVID, global warming, and the Black Lives Matter movement. Given that even the experts disagree, neither side is likely to persuade the other any time soon. The challenge for the Constitution is to manage the debate for years and even decades. Here the best option is to promote a pragmatic politics that encourages politicians to try different solutions, and just as promptly discard them when they fail. Obvious reforms include safeguards to ensure that key research is never blocked to defend political arguments, and sunset laws that automatically eliminate statutes that fail to show results.