IT HAS been one of the best-kept secrets of the presidential election campaign. Julia Thorne, the first wife of John Kerry, the Democrat candidate, has been suffering from cancer.After months of treatment out of the public eye, she has now been declared cancer-free and has returned to her home in Montana. Thorne is considering writing a book about her experience of illness, but not until after the November election. “She is somebody who has written books before and has a lot to share with people,” a family friend said. If the past is a guide, she may include some acerbic...