Former Florida House Speaker Marco Rubio (left) and Gov. Charlie Crist were cordial to each other earlier this month, but some supporters of Mr. Rubio's Senate bid are angry at the NRSC for favoring Mr. Crist.
FILE - In this March 6, 2014, file photo, Sen. Marco Rubio, R-Fla., speaks at the Conservative Political Action Committee annual conference in National Harbor, Md. Pitching himself as an ally to Silicon Valley, Rubio proposed in an appearance on Monday, March 10, 2014, giving cellphone companies more access to government-controlled airwaves as part of a package of pro-business initiatives he said would create "thousands upon thousands of high-paying jobs." (AP Photo/Cliff Owen, File)
FILE - In this Jan. 8, 2014 file photo, Sen. Marco Rubio, R-Fla., speaks on Capitol Hill in Washington. Amid a renewed Republican focus on poverty, Rubio is calling on Congress to overhaul the country’s higher education system, proposing a series of changes that he says will make college more affordable and bridge a “skills gap” in the American economy. (AP Photo/J. Scott Applewhite, File)
Sen. Marco Rubio, R-Fla., smiles after talking to the media as he leaves the Richard Gerstein Justice Building in Miami, Wednesday, March 12, 2014. Rubio reported for jury duty at a Miami-Dade County courthouse but was not called to serve on a panel. (AP Photo/Alan Diaz)
**FILE** Sen. Marco Rubio, Florida Republican, listens while testifying on Capitol Hill on Feb. 5, 2014, before the House Committee on Oversight and Government Reform hearing titled: "ObamaCare: Why the Need for an Insurance Company Bailout? (Associated Press)