Clinton wins Washington, D.C. primary
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Presumptive Democratic presidential nominee Hillary ClintonHillary Rodham ClintonPoll: 85 percent of Clinton supporters would vote for her again OMB director: Government shutdown not a 'desired end' Poll: Almost half say Trump off to poor start MORE is projected to win the Washington, D.C., primary.

The victory will give Clinton a majority of Washington’s 20 pledged delegates and send her into next month’s convention on a high note.

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After a tough challenge by rival Bernie SandersBernie SandersPelosi: 'Of course' Dems can be against abortion Kasich: 'I think political parties are on their way out' Sanders: Democratic Party's model is 'failing' MORE, Clinton closed out the primary season winning four of the final six contests. She will finish with an advantage of nearly 400 pledged delegates over Sanders.

Clinton won’t have earned enough pledged delegates from the primaries and caucuses to secure the nomination outright — Democrats rarely do — but superdelegates will push her across the threshold at the convention in Philadelphia in July.

The only remaining question is when and how Sanders decides to exit the race.

Clinton and Sanders were scheduled to meet Tuesday evening, and he will speak to his supporters in a video address Thursday.

Many Democrats are hopeful he’ll drop out of the race out that point and begin the process of unifying his millions of supporters behind Clinton ahead of a general election match-up against Republican Donald TrumpDonald TrumpFrench election: Le Pen, Macron ahead in early results Trump: Government 'involves heart,' unlike business Issa dodges when asked if he wants Trump to campaign alongside him MORE.

Sanders is expected to try to push the Democratic platform in a more progressive direction at the convention. 

He may also use leverage earned through the primaries to push through rules changes, such as the elimination of superdelegates.