John F. Kennedy

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This is an undated photograph of U.S. Sen. John F. Kennedy, D-Mass., at an unknown location. (AP Photo)

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John F. Kennedy is shown in this undated photo. (AP Photo)

Jacqueline Kennedy and her two children, John Jr. and Caroline stand at the top steps of the Executive Mansion as the body of President John F. Kennedy is carried from the Executive Mansion to lie in state at the Capitol, Nov. 24, 1963. (AP Photo)

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FILE - In this Nov. 25, 1963 file photo, an Irish cadet honor guard, center rows holding rifles, stands in formation as the U.S. flag is lifted from the coffin of President John F. Kennedy during his funeral services at Arlington National Cemetery in Arlington, Va. (AP Photo)

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FILE - In this July 26, 1963 file photo, U.S. President John F. Kennedy sits behind microphones at his desk in Washington after finishing his radio-television broadcast to the nation on the nuclear test ban agreement initialed by negotiators in Moscow. (AP Photo/John Rous)

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FILE - In this Oct. 21, 1960 file photo, Democratic presidential candidate, Sen. John F. Kennedy, center left, and Republican candidate, Vice President Richard Nixon, stand in a television studio during their presidential debate in New York. Polls found those who listened on radio awarded Nixon the debate victory. Those watching on TV gave Kennedy the nod. (AP Photo)

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FILE - In this Oct. 22, 1962 file photo, U.S. President John F. Kennedy addresses the nation by television and radio from the Oval Office in Washington, announcing a U.S. naval blockade of Cuba. (AP Photo/WOA)

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FILE - In this April 3, 1960 file photo, Sen. John F. Kennedy, Democratic presidential nominee, sits next to a playback of his televised appearance in Milwaukee, Wis. for the Wisconsin presidential primary two days later. (AP Photo)

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FILE - In this October 1962 file photo provided by the White House, President John F. Kennedy, left, claps time as his children Caroline, center, and John, Jr. dance in the Oval Office. Asked in 2012 if she ever felt overwhelmed by the legacy of the Kennedy years and the carefully cultivated image of a modern day Camelot, Kennedy said, "I can't imagine having better parents and a more wonderful brother. So I feel really fortunate that those are my family, and I wish they were here. (AP Photo/White House, File)

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FILE - In this 1962 file photo, President John F. Kennedy and his daughter, Caroline, sail off Hyannis Port, Mass. (AP Photo)

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FILE - In this Monday, Nov. 25, 1963 file photo, Jacqueline Kennedy, widow of assassinated President John F. Kennedy, holds the U.S. flag that covered the coffin of her husband at Arlington National Cemetery in Arlington, Va. after he was buried. (AP Photo/Eddie Adams)

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FILE - In this Sunday, Nov. 24, 1963 file photo, Jacqueline Kennedy kisses the casket of her husband, President John F. Kennedy, lying in state in the rotunda of the U.S. Capitol in Washington, accompanied by their daughter Caroline, kneeling alongside. (AP Photo/Henry L. Griffin, File)

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FILE - In this November 1963 file photo, mourners leave flowers on the lawn near the Texas Book Depository after the assassination of President John F. Kennedy in Dallas. (AP Photo/File)

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FILE - In this Friday, Nov. 22, 1963 file photo, women burst into tears outside Parkland Hospital upon hearing that President John F. Kennedy died from a shooting while riding in a motorcade in Dallas. (AP Photo/File)

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FILE - In this Nov. 23, 1963 file photo, the flag-draped casket of President John F. Kennedy lies in state in the East Room of the White House in Washington. The flag that draped the president’s coffin and the saddle, sword and boots from the riderless horse in his funeral procession go on display Nov. 22 at the Kennedy Library on the 50th anniversary of Kennedy's assassination. (AP Photo, File)

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FILE - In this October 1960 file photo Sen. John F. Kennedy and his wife, Jacqueline Kennedy, campaign in New York. 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)