Franklin D. Roosevelt was the first politician to recognize the power of radio. He appealed directly to the American people for support of his New Deal and for his foreign policy. Roosevelt's speeches and fireside chats were broadcast over networks only recently equipped with newsrooms. Listeners immediately learned of events they earlier would not have heard about for days. In those newsrooms, commentators began to interpret the news for average listeners, sometimes slanting it to reflect their own view. But it fell to a young star to demonstrate the full power of the medium. On October 30,...