Joe the Plumber’s 15 minutes aren’t up yet. Joe, whose full name is Samuel Joe Wurzelbacher, has begun work on a book about his rise to fame, and last week hired a Nashville publicity firm to secure him personal appearances and product endorsements. Publicist Jim Della Croce said there are already hundreds of offers, but he denied rumors that Wurzelbacher is launching a music career. “He’s not doing a country record,” said Della Croce. “That was presumptuous.”