Covering JFK: The decision to remove the 'bubble top'

On Nov. 22, 1963, the Secret Service prepared for President John F. Kennedy's procession through Dallas. Agents removed an optional feature of the president's 1961 Lincoln Continental, a plastic cover to protect the family from bad weather. As a Dallas Herald-Tribune reporter, Jim Lehrer recounts the decision to remove the "bubble top," and whether the Plexiglass could have saved Kennedy.