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COLUMBUS, OH - NOVEMBER 23: Republican presidential candidate Donald Trump addresses supporters during a campaign rally at the Greater Columbus Convention Center on November 23, 2015 in Columbus, Ohio. Trump spoke about immigration and Obamacare, among other topics, to around 14,000 supporters at the event.  (Photo by Ty Wright/Getty Images)
COLUMBUS, OH - NOVEMBER 23: Republican presidential candidate Donald Trump addresses supporters during a campaign rally at the Greater Columbus Convention Center on November 23, 2015 in Columbus, Ohio. Trump spoke about immigration and Obamacare, among other topics, to around 14,000 supporters at the event.  (Photo by Ty Wright/Getty Images)

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    Latest poll: Trump firmly in lead in Iowa

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Latest poll: Trump firmly in lead in Iowa

A new CNN/ORC poll shows Donald Trump maintaining a large lead in Iowa. CNN's Dana Bash has the details.

Latest poll: Trump firmly in lead in Iowa

A new CNN/ORC poll shows Donald Trump maintaining a large lead in Iowa. CNN's Dana Bash has the details.