TEXT: Former United States President John F. Kennedy and first lady Jackie Kennedy sit in a car in front of Blair House during the arrival ceremonies for Habib Bourguiba, president of Tunisia, in Washington, in this handout image taken on May 3, 1961. November 22, 2013 will mark the 50th anniversary of the assassination of President Kennedy. REUTERS/Abbie Rowe/The White House/John F. Kennedy Presidential Library (UNITED STATES - Tags: POLITICS ANNIVERSARY)    ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS