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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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Trump: Carson and I 'beating everybody by a lot'

A new NBC News/Wall Street Journal poll shows Dr. Ben Carson leading. CNN's Sara Murray reports.