The accidental presidency of Harry S. Truman, in words, photographs, and his ever-candid voice. He was a startling contrast to Franklin Roosevelt. A farmer's son from west Missouri, Truman didn't chat; he talked, without art or inflection. And yet, this man of big dreams and simple phrases led the country out of war, welcomed the United Nations, and ran a cross-country campaign that changed American politics. His plain speech, first seen as a liability,...