Republican presidential candidate Senator Marco Rubio (R-FL) speaks at a rally on the campus of the University of Central Arkansas on February 29, 2016 in Conway, Arkansas, the day before the "Super Tuesday" primaries.
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Some Marco Rubio advisers say get out before Florida
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Meet Marco Rubio 23 videos
Republican presidential candidate Senator Marco Rubio (R-FL) speaks at a rally on the campus of the University of Central Arkansas on February 29, 2016 in Conway, Arkansas, the day before the "Super Tuesday" primaries.
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Some Marco Rubio advisers say get out before Florida
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MELBOURNE, FL - MARCH 14: Republican presidential candidate Sen. Marco Rubio (R-FL) greets supporters while campaigning at That Little Restaurant March 14, 2016 in Melbourne, Florida. Florida holds its presidential primary tomorrow. (Photo by Win McNamee/Getty Images)
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Sen. Marco Rubio (R-FL) (left) confers with Sen. John McCain (R-AZ) (right) as U.S. Ambassador to Syria Robert Ford testifies before the Senate Foreign Relations Committee October 31, 2013 in Washington, D.C.
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Rubio, McCain test Trump's down ballot impact
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WASHINGTON, DC - JANUARY 28: U.S. Sen. Marco Rubio (R-FL) listens during a news conference on a comprehensive immigration reform framework January 28, 2013 on Capitol Hill in Washington, DC. A group of bipartisan senate members have reached to a deal of outlines to reform the nation immigration laws that will provide a pathway for the 11 million illegal immigrants in the country to citizenship. (Photo by Alex Wong/Getty Images)
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Rubio: Why I'm against Collins gun control amendment
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Rubio says Trump picking him for V.P. would backfire
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OKATIE, SC - FEBRUARY 11: Republican presidential candidate Sen. Marco Rubio (R-FL) speaks a campaign town hall meeting at the Sun City Hilton Head's Magnolia Hall February 11, 2016 in Okatie, South Carolina. Earlier in the week Rubio placed fifth in the New Hampshire primary, behind fellow GOP candidates Jeb Bush, John Kasich, Sen. Ted Cruz (R-TX) and Donald Trump, who won with 35 percent of the vote. (Photo by Chip Somodevilla/Getty Images)
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Rubio: Jeb's lock on Florida money was costly 2016 hurdle
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NORTH CHARLESTON, SC - JANUARY 14: Republican presidential candidates (L-R) New Jersey Governor Chris Christie and Sen. Marco Rubio (R-FL) participate in the Fox Business Network Republican presidential debate at the North Charleston Coliseum and Performing Arts Center on January 14, 2016 in North Charleston, South Carolina. (Photo by Scott Olson/Getty Images)
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MANCHESTER, NH - FEBRUARY 06: Republican presidential candidates Jeb Bush and Sen. Marco Rubio (R-FL) participate in the Republican presidential debate at St. Anselm College February 6, 2016 in Manchester, New Hampshire. Sponsored by ABC News, the Independent Journal Review and Google, this is the final televised debate before voters go to the polls for the New Hampshire primary on February 9. (Photo by Joe Raedle/Getty Images)
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Rubio 'embarrassed' by his personal attack on Trump
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