Director Ava DuVernay on sharing the story of ‘Selma’

The story of the seminal 1965 Alabama civil rights protests is being retold in the historical drama “Selma,” bringing to life the heroism of the activists and the brutality of the resistance. Gwen Ifill talks to director Ava DuVernay about contention over historical discrepancies and why no one has ever attempted to make a feature film about Dr. Martin Luther King Jr. before.