As the 40th anniversary of President Richard Nixon’s resignation approaches, you may think we have learned all there is to know about Watergate. But a key member of Nixon’s White House would disagree. John Dean says he now understands more about Watergate than when he played a central role in the scandal and its resolution. Dean has listened to thousands of hours of Nixon’s secret Oval Office tapes — many of which he says historians have overlooked. And he’s found a few surprises. Former White House counsel John Dean talks with guest host Susan Page about what he now believes the president knew and when he knew it.