Zawahiri Takes Lead of al-Qaida, Vows 'Blood for Blood'...

The death of Osama bin Laden left many have been asking who will control al-Qaida. The answer came Thursday in a statement posed on an Islamic website saying that Ayman al-Zawahri will now have "general leadership of al-Qaida." Jeffrey Brown discusses the shift in leadership with The Boston Globe's Juliette Kayyem and Georgetown University's Daniel Byman.