Earlier this week, ABC, CBS and NBC all noted the tenth anniversary of the death of John F. Kennedy, Jr. That Kennedy was an “icon” according to CBS’s Harry Smith, and “the Prince of Camelot” to ABC’s Chris Cuomo, a former cousin-in-law. Today marks the 40th anniversary of the death of Mary Jo Kopechne, killed July 18, 1969 after leaving a party with Senator Edward Kennedy. That night, Kennedy drove his car off a bridge, and left the scene with Kopechne still in the submerged vehicle; he did not call the police until the following morning. Over the course of...