30 years later, the 'lasting tragedy' of Tiananmen Square

In 1989, China's military suppressed a pro-democracy demonstration in Tiananmen Square with deadly force. Now, hundreds of thousands gathered in Beijing and across the country to mark the tragedy's 30th anniversary -- but the government expressed little sympathy. Nick Schifrin talks to Minxin Pei of Claremont McKenna College and Orville Schell of the Asia Society about new opposition in China.