PBS Newshour: Alleged Boston Marathon Bomber Pleads Not Guilty to 30 Criminal Charges

Nineteen-year-old Dzhokhar Tsarnaev pleaded not guilty to 30 criminal counts, ranging from carjacking to use of a weapon of mass destruction, resulting in the death of three people near the finish line of the 2013 Boston Marathon. Gwen Ifill talks to David Abel of the Boston Globe, who has covered the case since the bombings.