Nuclear Summit in Washington and Pledged vs. Super Delegates

More than 50 world leaders gathered in Washington to discuss nuclear security. More

Over 50 world leaders gathered in Washington to discuss nuclear security, but The New York Times' David Sanger calls the meeting more of a "bookend than a success" for the Obama administration. Plus CNN's Jeff Zeleny explains the Democratic delegate process full of pledged and super delegates.

AIR DATE 4/1/16