For many, the name Chappaquiddick conjures images of a drunken Sen. Edward Kennedy hitting on Mary Jo Kopechne in his Oldsmobile, losing control, and plunging into the water of Poucha Pond on Chappaquiddick Island, adjacent to Martha's Vineyard where President Obama was vacationing. Kopechne, a family friend, drowned; and Teddy fumbled for excuses about what happened. Now, a year after Kennedy died, his lifelong biographer Burton Hersh, armed with fresh interviews with Kennedy's mistress at the time, tells Whispers that the whole July 1969 episode should have been handled as a simple crash, leaving the senator's legacy untainted. "It was...