Republican presidential candidates, from left, Bobby Jindal, Rick Santorum, George Pataki, and Lindsey Graham take the stage during the CNBC Republican presidential debate at the University of Colorado on Wednesday. Mark J. Terrill/AP hide caption

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Mark J. Terrill/AP

Preparations underway in the Media Center at the third Republican debate on the campus of the University of Colorado in Boulder, Colo. Robyn Beck/AFP/Getty Images hide caption

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Robyn Beck/AFP/Getty Images

Republican presidential candidates (left-right) Bobby Jindal, Rick Perry, Rick Santorum, Carly Fiorina and George Pataki on stage during the first "kid's table" debate last month. John Minchillo/AP hide caption

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John Minchillo/AP

Why Should Candidates Show Up To The 'Kids' Table' Debate?

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Republican presidential candidates from left, Jim Gilmore, Lindsey Graham, Bobby Jindal, Rick Perry, Rick Santorum, Carly Fiorina, and George Pataki take the stage for a pre-debate forum at the Quicken Loans Arena, Thursday, Aug. 6, 2015, in Cleveland. Seven of the candidates have not qualified for the primetime debate. Andrew Harnik/AP hide caption

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Andrew Harnik/AP

Former Florida Gov. Jeb Bush poses with supporters for photos during a fundraiser in May. Alan Diaz/AP hide caption

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Alan Diaz/AP

Billionaire Or Bust: Who Are Rich Backers Lining Up With?

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Sen. Ted Cruz, R-Texas, apologized Wednesday after making a joke about Joe Biden while the vice president was mourning the death of his son. Charles Dharapak/Associated Press hide caption

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Charles Dharapak/Associated Press

Former Florida Gov. Jeb Bush had a tough week with his changing positions on the Iraq War and trying to explain whether he would have authorized it, knowing what we know now. Ross D. Franklin/AP hide caption

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Ross D. Franklin/AP

Former Florida Gov. Jeb Bush is one of four "un-candidates" being targeted by liberal groups Campaign Legal Center and Democracy 21. They say the politicians have crossed the line into candidacy based on their activities in recent months. Scott Olson/Getty Images hide caption

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U.S. Communists have been running for office for decades. Above, the Party's presidential ticket in 1936. Ken Rudin collection hide caption

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Ken Rudin collection

April 12 podcast

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Running mates? Mitt Romney greets former Gov. Mike Huckabee after taking part in a Republican presidential forum on Huckabee's Fox News program on Dec. 3, 2011. Henny Ray Abrams/AP hide caption

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Henny Ray Abrams/AP

Evangelical Leader: Romney-Huckabee Would Make 'Appealing' GOP Ticket

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