MARY MAPES IS BACK. With her memoir, Truth and Duty: The Press, The President, and the Privilege of Power, the former CBS News producer is trying to write a second act for her career. Sadly, if her book is any indication, her second act is just a repeat of the first. Mapes was the producer of the CBS 60 Minutes II segment on President Bush's service in the Texas Air National Guard that aired on September 8, 2004. According to the segment, President Bush had received preferential treatment in being admitted to the Guard, and once in, had served dishonorably....