FILE - This Nov. 22, 1963 file photo shows President John F. Kennedy riding in motorcade with first lady Jacqueline Kenndy in Dallas, Texas. (AP Photo, file)FILE - Arthur Schlesinger Jr., Harvard University historian and President John F. Kennedy's former personal assistant, holds a brief lecture as his book "A Thousand Days: John F. Kennedy in the White House" was presented to Italian public on Jan. 24, 1966 in Rome. Sitting at left is Italian journalist and author Luigi Barzini Jr. who introduced Schlesinger to the audience. (AP Photo/Gianni Foggia, File)FILE - In this Nov. 22, 1963 file photo, the limousine carrying mortally wounded President John F. Kennedy races toward the hospital seconds after he was shot in Dallas. (AP Photo/Justin Newman, File)FILE - Secret servicemen standing on running boards follow the presidential limousine carrying President John F. Kennedy, right, rear seat, and first lady Jacqueline Kennedy, left, as well as Texas Gov. John Connally and his wife, Nellie, in Dallas, Texas, Nov. 22, 1963. (AP Photo/Jim Altgens, File)
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FILE - This Nov. 22, 1963 file photo shows President John F. Kennedy riding in motorcade with first lady Jacqueline Kenndy in Dallas, Texas. (AP Photo, file)
