Outspoken cleric decries Islamic State as anti-Islamic

Sheikh Muhammad al-Yaqoubi, a prominent Syrian Sunni cleric and vocal critic of the Islamic State, led prayers at the funeral of American beheading victim Peter Kassig. Chief foreign correspondent Margaret Warner interviews al-Yaqoubi, exiled from his country, about atrocities committed by the Islamic State, why the militant group is able to gain followers and the fight against the Assad regime.