Marco Rubio Marco Rubio

Donald Trump greets supporters after speaking at a caucus night watch party at the Treasure Island Hotel & Casino in Las Vegas. Trump is favored to do well Super Tuesday. Ethan Miller/Getty Images hide caption

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Ethan Miller/Getty Images

Republican presidential candidate Donald Trump speaks at his election night party February 20, 2016 in Spartanburg, South Carolina. The New York businessman won the first southern primary decisively. Spencer Platt/Getty Images hide caption

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Spencer Platt/Getty Images

Bernie Sanders and Donald Trump deliver victory speeches at their respective watch parties in New Hampshire. Jewel Samad/AFP; Joe Raedle/Getty Images hide caption

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Jewel Samad/AFP; Joe Raedle/Getty Images

Republican presidential candidates, from right, Ohio Gov. John Kasich, former Florida governor Jeb Bush and Sen. Marco Rubio, R-Fla., participate Jan. 28 in a GOP debate in Des Moines, Iowa. Rubio's strong third-place finish in Iowa has given him momentum and more backing from the same establishment Republicans that Bush and Kasich need for their campaigns to survive. Scott Olson/Getty Images hide caption

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Scott Olson/Getty Images

Jeb Bush holds a campaign town hall meeting at the Alpine Club on Monday in Manchester, N.H. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images

Heading Into New Hampshire, GOP 'Front-Runners' Are Anything But

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Republican presidential candidate Marco Rubio speaks to a capacity crowd during a campaign event in Exeter, N.H. Steven Senne/AP hide caption

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Steven Senne/AP

Signs Of 'Marco-mentum' For Rubio In New Hampshire

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Democratic presidential candidate Hillary Clinton speaks at a rally in Marshalltown, Iowa. Clinton is narrowly ahead of Sanders, but within the margin of error in the final Iowa poll. Andrew Harnik/AP hide caption

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Andrew Harnik/AP

Hillary Clinton at a campaign event in Davenport, Iowa. Clinton has seen the race in Iowa tighten but is hoping for a boost from the endorsement of the state's largest newspaper. Brendan Hoffman/Getty Images hide caption

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Brendan Hoffman/Getty Images

Students from Manchester University visit the caucus exhibit at Iowa's state museum in Des Moines Scott Detrow/NPR hide caption

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Scott Detrow/NPR

Politics 101: A College Class Gets Up Close And Personal With The Iowa Caucuses

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Republican presidential candidate Sen. Marco Rubio, R-Fla. holds a rifle during a campaign stop Jan. 15, 2016, at Sturm, Ruger & Co., in Newport, N.H. Matt Rourke/AP hide caption

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Matt Rourke/AP

Establishment Republicans Scramble To Top Trump

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