Obama, Clintons Honor President Kennedy 50 Years After Assassination

A flag flies at half-staff above the White House in Washington, early morning, Nov. 22, 2013. President Barack Obama ordered that flags be lowered at government buildings to mark the 50th anniversary of President John F. Kennedy's assassination.

The eternal flame flickers in the early morning light at the grave of John F. Kennedy at Arlington National Cemetery on Nov. 22, 2013, on the 50th anniversary of Kennedy's death.

A banner of John F. Kennedy is lowered to the stage before a ceremony to mark the 50th anniversary of his assassination, near Dealey Plaza in Dallas, Texas, Nov. 22, 2013.

Tatiana Schlossberg, granddaughter of President John F. Kennedy, stands still as the U.S. national anthem is played during a short ceremony at the JFK memorial, Runnymede, England, Nov. 22, 2013.

Members of the Kennedy family, including former U.S. Ambassador to Ireland, Jean Kennedy Smith, fourth from left, hold hands as they pay their respects at the gravesite of President John F. Kennedy, Nov. 22, 2013, at Arlington National Cemetery, Washington.

Images of the Kennedys are displayed at a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, at Dealey Plaza in Dallas,Texas, Nov. 22, 2013.