'Thirteen Soldiers' on serving a cause greater than yourself

Aired: 11/17/2014 | 0:01:23 | Clip
Sen. John McCain's new book, "Thirteen Soldiers," paints a historical portrait of America at war, using personal stories of the warriors who fought. With fewer and fewer U.S. members of Congress having served in the military, Gwen Ifill asks the senator and veteran what lawmakers might learn from their example.