General Omar Bradley said of him, "I have never known a braver man or a more devoted soldier." But for much of his life, Theodore Roosevelt's son Ted seemed born to live in his father's shadow. With the same wide smile, winning charm, and vigorous demeanor, Ted possessed limitless potential, with even the White House within his reach. In the First World War, Ted braved gunfire and gas attacks in France to lead his unit into battle. Yet even after...