John F. Kennedy

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Detroit Lions' Nick Pietrosante (33), left, and Wayne Walker (55), right, stand during ceremonies honoring slain President John F. Kennedy, before a game between Detroit and the Minnesota Vikings at Metropolitian Stadium in Minneapolis, in this Nov. 24, 1963 photo. (AP Photo)

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President John F. Kennedy is seen riding in motorcade approximately one minute before he was shot in Dallas, Tx., on Nov. 22, 1963. In the car riding with Kennedy are Mrs. Jacqueline Kennedy, right, Nellie Connally, left, and her husband, Gov. John Connally of Texas. (AP Photo)

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FILE - In this Aug.23, 1963 file photo, Sen. Edward M. Kennedy, D-Mass., center, poses with his brothers U. S. Attorney General Robert F. Kennedy, left, and President John F. Kennedy at the White House in Washington. The Kennedy image, the "mystique" that attracts tourists and historians alike, did not begin with his presidency and is in no danger of ending 50 years after his death. Its journey has been uneven, but resilient _ a young and still-evolving politician whose name was sanctified by his assassination, upended by discoveries of womanizing, hidden health problems and political intrigue, and forgiven in numerous polls that place JFK among the most beloved of former presidents. (AP Photo)

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FILE - In this Aug.23, 1963 file photo, Sen. Edward M. Kennedy, D-Mass., center, poses with his brothers U. S. Attorney General Robert F. Kennedy, left, and President John F. Kennedy at the White House in Washington. The Kennedy image, the "mystique" that attracts tourists and historians alike, did not begin with his presidency and is in no danger of ending 50 years after his death. Its journey has been uneven, but resilient _ a young and still-evolving politician whose name was sanctified by his assassination, upended by discoveries of womanizing, hidden health problems and political intrigue, and forgiven in numerous polls that place JFK among the most beloved of former presidents. (AP Photo)

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FILE - In this Sunday, Nov. 24, 1963 file photo, the casket of President John F. Kennedy reaches the Capitol in Washington on a horse-drawn caisson, accompanied by a symbolic riderless horse named Black Jack, with boots reversed in the stirrups, symbolizing a fallen leader. (AP Photo)

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FILE - In this Tuesday, Oct. 29, 2013 file photo, Arlington House sits atop a hill overlooking the eternal flame at the grave site of President John F. Kennedy at Arlington National Cemetery in Arlington, Va. (AP Photo/Susan Walsh, File)