How should we remember activist Stokely Carmichael?

Stokely Carmichael marched with Martin Luther King Jr., campaigned for voting rights and against Vietnam, was a Pan-African revolutionary and coined the term "Black Power." But what's the complete story behind this leading figure of the civil rights movement? Gwen Ifill talks to Peniel Joseph of Tufts University about his new biography, "Stokely: A Life."