Defense Secretary Robert M. Gates discusses the war in Afghanistan in a candid and wide-ranging interview with Katie Couric. Later...Ed Liddy, the man who took over the reins of AIG, speaks to Steve Kroft about the gargantuan task ahead. Also...the s... (more)unglasses come off Anna Wintour as the Vogue editor reveals why she always wears them. She talks to Morley Safer in her first long-length interview for U.S. television.