Ben Carson, right, watches as Donald Trump speaks during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

Credit: Lisa Gardner

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Credit: Lisa Gardner

Republican presidential candidate, former Florida Gov. Jeb Bush speaks during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

Credit: Lisa Gardner

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Credit: Lisa Gardner

John Kasich speaks during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

Credit: Lisa Gardner

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Credit: Lisa Gardner

John Kasich makes a point during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

Credit: Lisa Gardner

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Credit: Lisa Gardner

Republican presidential candidate, Sen. Rand Paul, R-Ky., speaks during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

Credit: Lisa Gardner

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Credit: Lisa Gardner

Ben Carson speaks during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

Credit: Lisa Gardner

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Credit: Lisa Gardner

Mike Huckabee, left, speaks as Jeb Bush, center and Marco Rubio look on during the CNBC Republican presidential debate at the University of Colorado, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

Credit: Lisa Gardner

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Credit: Lisa Gardner

Ted Cruz talks about the mainstream media during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

Credit: Lisa Gardner

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Credit: Lisa Gardner

Jeb Bush, left, speaks as Marco Rubio looks on during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

Credit: Lisa Gardner

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Credit: Lisa Gardner

Rand Paul, right, speaks as Chris Christie looks on during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

Credit: Lisa Gardner

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Credit: Lisa Gardner

Ted Cruz, center, speaks as Carly Fiorina, left, and Chris Christie listen during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

Credit: Lisa Gardner

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Credit: Lisa Gardner

Republican presidential candidate, businesswoman Carly Fiorina speaks during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

Credit: Lisa Gardner

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Credit: Lisa Gardner

Republican presidential candidates, from left, John Kasich, Mike Huckabee, Jeb Bush, Marco Rubio, Donald Trump, Ben Carson, Carly Fiorina, and Ted Cruz take the stage during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

Credit: Lisa Gardner

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Credit: Lisa Gardner

Marco Rubio, right, and Jeb Bush, argue a point during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

Credit: Lisa Gardner

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Credit: Lisa Gardner

Carly Fiorina speaks during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

Credit: Lisa Gardner

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Credit: Lisa Gardner

Donald Trump speaks during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

Credit: Lisa Gardner

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Credit: Lisa Gardner

Chris Christie makes a point during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

Credit: Lisa Gardner

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Credit: Lisa Gardner

Julian Dreiman of Boulder, Colo., holds up sign in the free speech zone on the campus of the University of Colorado before the Republican presidential debate Wednesday, Oct. 28, 2015, in Boulder, Colo. Several protests were being staged across the campus as Republican candidates faced off in the Coors Events Center. (AP Photo/David Zalubowski)

Credit: Lisa Gardner

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Credit: Lisa Gardner

Giant puppets of Republican presidential candidates Marco Rubio and Jeb Bush are displayed in the "Free Speech Zone" outside of the GOP presidential debate on Wednesday, Oct. 28, 2015, at the Coors Event Center on the University of Colorado campus in Boulder, Colo. (Jeremy Papasso/Daily Camera via AP) NO SALES; MANDATORY CREDIT

Credit: Lisa Gardner

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Credit: Lisa Gardner

A giant Donald Trump puppet is displayed in the "Free Speech Zone" outside the venue of the GOP presidential debate on Wednesday, Oct. 28, 2015, at the Coors Event Center on the University of Colorado campus in Boulder, Colo. (Jeremy Papasso/Daily Camera via AP) NO SALES; MANDATORY CREDIT

Credit: Lisa Gardner

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Credit: Lisa Gardner