Former Florida Gov. Jeb Bush's campaign dismissed the no-new taxes pledge as something "circulated by lobbying groups" and he says he "will not sign." David Goldman/AP hide caption

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Republican presidential hopeful Sen. Ted Cruz speaks at the Republican Leadership Summit Saturday in Nashua, N.H. Jim Cole/AP hide caption

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It's been 35 years since Ronald Reagan announced his run for president. He did so just two months before the Iowa caucuses, unlike the protracted campaigning that takes place today. WJZ/AP hide caption

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A protester in front of Sen. Marco Rubio's Doral, Fla., office in 2013 urges Rubio to stop opposing the inclusion of lesbian, gay, bisexual and transgender families in the Senate's immigration bill. Joe Raedle/Getty Images hide caption

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Marco Rubio celebrates onstage with his family in 2010 after winning his U.S. Senate seat in Florida when he was just 39 years old. Now, he's expected to embark on a run for president. Alan Diaz/AP hide caption

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Canadian athletes hold up the national flag during the 2014 Winter Olympics in Sochi, Russia. Sen. Ted Cruz was born in Calgary, and some question his eligibility to run for president in the U.S. Darron Cummings/AP hide caption

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