THE battle between Levi Johnston (above) and Sarah Palin isn’t over yet. Johnston — best known for impregnating the former vice-presidential candidate’s daughter, Bristol — “is shopping a book,” his bodyguard/publicist, Tank, tells New York magazine. And it seems the book will focus on the Wasilla, Alaska, political family. “There are still many untold stories about the Palins,” he said. Until the tell-all is released, though, Johnston is considering “a leading role” in a movie and a possible upcoming TV “docu-drama.”