Editor's Note: 1.5 million letters were sent to Jacqueline Kennedy after JFK's assassination in 1963. Author Ellen Fitzpatrick's new book, "Letters to Jackie,” highlights 250 of those condolences. It is published by Ecco and goes on sale at bookstores March 2, 2010. [cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2010/images/02/25/letters.cover.art.jpg caption=""Letters to Jackie" is a first-ever compilation of condolences received … Continue reading 'Letters to Jackie' captures a nation's anguish