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    Carson and Trump neck-and-neck in new Iowa poll

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Carson and Trump neck-and-neck in new Iowa poll

A new CNN/ORC poll shows Donald Trump and Ben Carson running neck-and-neck in Iowa. CNN's Sara Murray breaks it down.

Carson and Trump neck-and-neck in new Iowa poll

A new CNN/ORC poll shows Donald Trump and Ben Carson running neck-and-neck in Iowa. CNN's Sara Murray breaks it down.