What Are the Motives Behind Iran's 'Charm Offensive'?

Iran's President Hassan Rouhani is reaching out to the U.S. and the world in ways his predecessors never did. Gwen Ifill talks to Karim Sadjadpour of the Carnegie Endowment for International Peace and Haleh Esfandiari of the Woodrow Wilson International Center for Scholars for more context into the diplomatic thaw.