The source in this podcast is primarily an article from Atlas Obscura about the 1976 Great American Horse Race, which was unexpectedly won by a mule named Lord Fauntleroy. The article details the race's context within the American Bicentennial celebrations, the diverse participants and their motivations, and the arduous journey across 13 states. Lord Fauntleroy's victory surprised everyone except his owner, Virl Norton, who strategically utilized the mule's endurance for a remarkable win. The surrounding text showcases Atlas Obscura's website content, including travel options, articles, and other features.