Rubio wins DC caucus

Marco RubioMarco Antonio RubioStudents gather outside White House after walkout to protest gun violence Overnight Energy: Senate confirms Bridenstine as NASA chief | Watchdog probes Pruitt’s use of security detail | Emails shine light on EPA science policy changes Senate confirms Trump’s pick to lead NASA 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 John TrumpIG investigating Comey memos over classified information: report Overnight Defense: Congress poised for busy week on nominations, defense bill | Trump to deliver Naval Academy commencement speech | Trump administration appeals decision to block suspected combatant's transfer Top Pruitt aid requested backdate to resignation letter: report MORE and Texas Sen. Ted CruzRafael (Ted) Edward CruzCruz's Dem challenger slams Time piece praising Trump Race for Republican Speaker rare chance to unify party for election 32 male senators back Senate women's calls to change harassment rules 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.