Rubio wins DC caucus

Marco RubioMarco RubioRubio: 'I hope' Mexican elections won't end partnership against cartels Election hacking fears turn heat on Homeland Security Will Republicans stand up to the NRA's insurrection rhetoric? MORE has been projected the winner of the Washington, D.C., Republican caucus Saturday. 

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The Florida senator beat out Ohio Gov. John Kasich by just 50 votes, according to The New York Times, ultimately winning 37 percent of the vote. 

Kasich followed with 35 percent. Donald TrumpDonald TrumpCarter Page questioned in FBI Russia investigation: report Major progressive group rolls out first incumbent House endorsement Amazon’s acquisition of Whole Foods underscores the threat posed by ‘big data’ MORE and Texas Sen. Ted CruzTed CruzThree GOP senators to vote against taking up healthcare bill without changes Trump phones Senate holdouts on GOP healthcare bill A bipartisan consensus against 'big pharma' is growing in Congress MORE trailed with 14 and 12 percent of the vote, respectively.

D.C. is a small victory for Rubio, who has struggled in primary contests; his lone win was in Minnesota. 

D.C. has 19 delegates. Rubio will take 10 and Kasich will take nine. Cruz and Trump didn't win any delegates, which could bolster their anti-Washington talking points. 

Rubio and Kasich will both make what could be their last stands on Tuesday in their home states of Florida and Ohio, hoping the winner-take-all contests will help halt Trump's trajectory toward the nomination.