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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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Top tier in GOP race coming into focus

A new poll shows Donald Trump and Ben Carson continuing to battle for first place while Ted Cruz and Marco Rubio are battling for third place. CNN's Sara Murray reports.

Top tier in GOP race coming into focus

A new poll shows Donald Trump and Ben Carson continuing to battle for first place while Ted Cruz and Marco Rubio are battling for third place. CNN's Sara Murray reports.