Rubio wins DC caucus

Marco RubioMarco RubioObama: Trump's rigged election talk 'not a joking matter' Obama: Trump and Putin have a 'bromance' Obama slams Rubio for Trump support MORE has been projected the winner of the Washington, D.C., Republican caucus Saturday. 

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 TrumpTrump steps up campaign spending in final stretch Clinton and Trump chat at Al Smith dinner Video shows Trump being turned away at polling sites in 2004 MORE and Texas Sen. Ted CruzTed CruzTrump steps up campaign spending in final stretch McMullin tops new poll of Utah voters Cruz: Voter fraud a challenge 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.