Bernie Sanders addresses supporters on Coney Island Boardwalk ahead of the April 19 New York primary. Pacific Press/LightRocket via Getty Images hide caption

Tamara Keith
Tamara Keith covers business for NPR.Democratic presidential candidate Hillary Clinton speaks at her primary election night rally in Philadelphia. Matt Rourke/AP hide caption
With The Nomination All But Decided, Clinton's And Sanders' Goals Change
Hillary Clinton Hopes To Extend Delegate Lead As She Eyes General Election
Vermont Sen. Bernie Sanders speaks at a campaign rally in Poughkeepsie, N.Y. Kenneth Gabrielsen/Getty Images hide caption
Campaign Mystery: Why Don't Bernie Sanders' Big Rallies Lead To Big Wins?
Sen. Bernie Sanders waves to a crowd gathered at Gettysburg College in Gettysburg, Pa., on Friday. Pennsylvania holds its presidential primary Tuesday. Mark Wilson/Getty Images hide caption
Sanders Adviser Says Campaign May Have To 'Re-Evaluate' After Tuesday
Hillary Clinton Campaigns In Pennsylvania After Big Win In New York
Democrats Hillary Clinton And Bernie Sanders Debate Ahead Of New York Primary
Presidential candidate Bernie Sanders, I-Vt., walks offstage to greet the massive crowd gathered in New York's Washington Square Park on Wednesday. The Washington Post/The Washington Post/Getty Images hide caption
Hillary Clinton and Bernie Sanders shake hands at the end of a Democratic presidential primary debate last month. Carlos Osorio/AP hide caption