When Throckmorton P. Gildersleeve bade farewell to Fibber McGee and Molly and left Wistful Vista on a train in 1941, no one could have predicted that he would be riding the airwaves with his own new show until 1957. But when one listens to episodes of radio's first spinoff, it becomes clear the The Great Gildersleeve succeeded because its likable and amusing characters were appealingly fallible, much like the folks each of us knew in our...