Director DuVernay talks writing speeches for MLK in 'Selma'

The movie, "Selma," is getting plenty of attention. What's less well-known is the extent to which director Ava DuVernay rewrote much of the script -- and that includes writing her own versions of Dr. King's speeches. Gwen asked DuVernay about the unique challenges of trying to capture the essence of iconic speeches without copying them.