AMERICAN SANCTUARY: MUTINY, MARTYRDOM AND NATIONAL IDENTITY IN THE AGE OF REVOLUTION By A. Roger Ekirch Pantheon Books, $30, 293 pages A consensus holds that last year’s politics were messy; some say the messiest ever, but A. Roger Ekirch tells us otherwise. In 1800 the run-up to the nation’s “first full-blown presidential campaign” was messier, and…