What's Behind the Shift in Public Opinion Over Gay Marriage?

Aired: 3/19/2013 | 0:10:15 | Clip
A new survey shows a majority of Americans support gay marriage. Support has also grown in the courts and among politicians, including former State Secretary Hillary Clinton and Sen. Rob Portman. Gwen Ifill examines the shift with Michael Dimock of the Pew Research Center and Greg Lewis of Georgia State University.