Senator Bernie Sanders said on Sunday that he would “take our campaign for transforming the Democratic Party into the convention,” refusing to concede the presidential nomination to Hillary Clinton though not explicitly saying he would challenge her for it.

Mrs. Clinton earned enough delegates to clinch the nomination last week, but Mr. Sanders has declined to end his campaign. He has contended that he could persuade enough superdelegates, the party leaders who have overwhelmingly backed Mrs. Clinton, to switch their support to him by arguing that he would be the stronger candidate against Donald J. Trump, the presumptive Republican presidential nominee.

Bernie Sanders Refuses to Concede Nomination to Hillary Clinton – The New York Times

hmmm