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BOULDER, CO - OCTOBER 28:  Presidential candidates Donald Trump (L) speaks while Ben Carson looks on during the CNBC Republican Presidential Debate at University of Colorados Coors Events Center October 28, 2015 in Boulder, Colorado.  Fourteen Republican presidential candidates are participating in the third set of Republican presidential debates.  (Photo by Justin Sullivan/Getty Images)
BOULDER, CO - OCTOBER 28:  Presidential candidates Donald Trump (L) speaks while Ben Carson looks on during the CNBC Republican Presidential Debate at University of Colorados Coors Events Center October 28, 2015 in Boulder, Colorado.  Fourteen Republican presidential candidates are participating in the third set of Republican presidential debates.  (Photo by Justin Sullivan/Getty Images)

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    Poll: Trump, Carson neck-and-neck in South Carolina

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Poll: Trump, Carson neck-and-neck in South Carolina

The oddest couple in politics, Donald Trump and Dr. Ben Carson, are again on top in a new poll, out of South Carolina. CNN's Dana Bash reports.

Poll: Trump, Carson neck-and-neck in South Carolina

The oddest couple in politics, Donald Trump and Dr. Ben Carson, are again on top in a new poll, out of South Carolina. CNN's Dana Bash reports.