Donald Trump (left) and Ted Cruz joke about Trump's comments that Cruz was a "maniac" and didn't have the right temperament to be president. They played nice then, but will they again? John Locher/AP hide caption

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Democratic presidential candidates Bernie Sanders, Hillary Clinton and Martin O'Malley stand on the stage prior to Saturday's Democratic primary presidential debate in Des Moines, Iowa. Alex Wong/Getty Images hide caption

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Hillary Clinton had to defend her views on foreign policy and President Obama's during Saturday's Democratic presidential debate, following the Paris attacks. Charlie Neibergall/AP hide caption

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Marco Rubio (center) was able to stand out even while being targeted by Jeb Bush (left), someone once described as a mentor. Donald Trump looks on. Mark J. Terrill/AP hide caption

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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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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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Sen. Marco Rubio, R-Fla., left, and Ben Carson have surged ahead of other GOP candidates, like former Florida Gov. Jeb Bush, to take center stage with Donald Trump at next week's GOP debate. Andrew Harnik/AP hide caption

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Hillary Clinton participated in 25 primary debates during her 2008 campaign — experience that should serve her well on Tuesday night. But she still has to appear likable and at ease on stage this time. Matt Rourke/AP hide caption

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Republican presidential candidate, businesswoman Carly Fiorina speaks during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Sept. 16, 2015. Mark J. Terrill/AP hide caption

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Fiorina As CEO: 'Colossal Failure' Or 'The Right Leader'?

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