If John Edward’s new book turns out to be as popular as his previous endeavors, we could soon see rosaries for sale at Wal-Mart.With Practical Praying: Using the Rosary to Enhance Your Life, the best-selling author and TV psychic medium is putting himself on the line in an entirely new way. “I had major, major blocks on a personal level,” he said in a telephone interview. “I’ve been very private about my rosary praying.”A book about the rosary wouldn’t be commercial coming from most writers, but Mr. Edward, 35, has such a built-in following of far-reaching fans that his book...