Sen. Charles Schumer, D-N.Y. and Sen. Marco Rubio, R-Fla., (second and third from left) announced plans to work on a bipartisan immigration proposal with their colleagues on Jan. 28 on Capitol Hill. They were also some of the first to respond to a leaked White House proposal. Alex Wong/Getty Images hide caption

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Ohio State College Republicans await Mitt Romney's son, Craig, who canvassed with them in Columbus last October. Courtesy College Republicans at The Ohio State University hide caption

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Sen. Marco Rubio, R-Fla, is among a bipartisan group of eight senators who this week announced a plan to overhaul the nation's immigration laws. Charlie Neibergall/AP hide caption

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Incoming Texas Sen. Ted Cruz, who spoke during the Republican National Convention this summer in Tampa, Fla., is among a number of minority politicians seen as rising stars in the GOP. Spencer Platt/Getty Images hide caption

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Sen. Marco Rubio, R-Fla., delivers a speech during the annual Conservative Political Action Conference in February in Washington. Win McNamee/Getty Images hide caption

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Mitt Romney, accompanied by Rep. Ileana Ros-Lehtinen, R-Fla. (third from right), campaigns Wednesday at a U.S.-Cuba Democracy Political Action Committee event at Miami-Dade College in Miami. Charles Dharapak/AP hide caption

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Sen. Marco Rubio, R-Fla., considered a potential 2012 veep pick, speaks at the Ronald Reagan Presidential Library in Simi Valley, Calif. in August.

Jae C. Hong/AP hide caption

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Sen. Marco Rubio, R-Fla., considered a potential 2012 veep pick, speaks at the Ronald Reagan Presidential Library in Simi Valley, Calif. in August.

Jae C. Hong/AP hide caption

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