American mythology loves nothing more than the reluctant hero: the man -- it is usually a man -- whose natural talents have destined him for more than obliging obscurity. George Washington, we are told, was a leader who would have preferred to have been a farmer. Thomas Jefferson, a writer. Martin Luther King, Jr., a preacher. These men were roused from lives of perfunctory achievement, our legends have it, not because they chose their own exceptionalism, but because we, the people, chose it for them. We -- seeing greatness in them that they were too humble to observe themselves -- conferred on them uncommon paths. Historical circumstance became its own call of duty, and the logic of democracy proved itself through the answer.