He was the top male box office attraction at the movies, one of the most widely read newspaper columnists in America, a radio commentator with an audience of more than 60 million, and a globetrotting speaker who filled lecture halls across the land. But how did humorist Will Rogers also become one of the most powerful political figures of his day? From just before World War I, through the Roaring Twenties, Prohibition, and the Great Depression, Rogers...