James Madison enters the scene not with the thunder of a soldier’s drum or the roar of a crowd but with the modest scrape of a chair in a quiet room, a notebook open, and a mind intent on turning friction into form. He is small in stature and huge in gravity, frail in appearance and relentless in attention, a man whose power is the patient sentence and whose temperament is that of a mechanic of liberty rather than a herald of it. He would never be the loudest voice in a hall, but halls accustomed to noise learned quickly that it was Madison’s hushed questions—the precise framing, the tested premise, the meticulous next step—that moved assemblies from complaint to architecture. If Washington invented the posture of the executive and Adams tested the dignity of law under storm, Madison built the room where those postures and dignities could have a  ...