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Marco Rubio said voters will find out on March 15 how confident he is. | Getty Rubio vows to win Florida after poor showing on Saturday

Sen. Marco Rubio brushed off his dismal performance on Saturday night, vowing to win Florida and other future primary contests.

“We’re going to win Florida, and you’ll find out on March 15 how confident we are,” Rubio said, in Spanish, to supporters in San Juan, Puerto Rico, which holds its primary on Sunday. He's playing not just for the 23 delegates at stake in the U.S. territory, but also for the support of the roughly one million Puerto Ricans in Florida. He is the only Republican candidate to visit the island.

“Tonight we will have more delegates than we did last night,” Rubio promised. “This map only gets better for us.”

Rubio came in third place in Kansas’s caucuses on Saturday, behind Ted Cruz and Donald Trump, despite touting endorsements from former Sen. Bob Dole, Gov. Sam Brownback and other top establishment figures. Rubio finished a dismal fourth in Maine, with 8 percent of the vote and no delegates.

“We knew this would be the roughest period in the campaign given the electoral makeup of the map,” Rubio said.

Rubio weighed in on Puerto Rico's fiscal crisis, repeating that he does not support a restructuring of the territory's debt but instead a permanent change in fiscal policy. The problem facing Puerto Rico, he said, is the same one facing Washington: there is too much government spending, which can only be solved through economic growth.

Solving the state’s debt problem would prevent the exodus of skilled workers from Puerto Rico to Florida, Rubio said, quipping that they were nonetheless welcome in his state.

He repeated his stance that Puerto Rico deserves a referendum on statehood. As citizens of a U.S. territory, Puerto Ricans cannot cast votes in presidential elections.

Kristin Roberts contributed to this report.