A hundred years ago, the most famous athlete in America was a horse. But Dan Patch was more than a sports star; he was a cultural icon in the days before the automobile. Born crippled and unable to stand, he was nearly euthanized. For a while, he pulled the grocer's wagon in his hometown of Oxford, Indiana. But when he was entered in a race at the county fair, he won -- and he kept on winning. Harness racing was the top sport in America at the time,...