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. In the 2016 race for the White House, upcoming contests in Wisconsin and New York loom large. For Democrats, the New York primary is the first competitive race since 1992, and for Republican Donald Trump, he’ll need to bounce back in the Empire State if he loses big in Wisconsin. Plus CNN’s Jeff Zeleny explains the Democratic delegate process full of pledged and super delegates. And Reuters’ Joan Biskupic explains the White House strategy to confirm Supreme Court nominee Merrick Garland and secure and “enduring legacy” for Obama.