How the U.S. missed warning signs about the Islamic State

Aired: 9/29/2014 | 0:07:08 | Clip
President Obama acknowledged that the intelligence community underestimated the force of the Islamic State militants and overestimated the will of Iraq’s military. Frederick Kagan of the American Enterprise Institute joins Judy Woodruff to offer his perspective on what the intelligence community misjudged about the Islamic State.