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Republican presidential hopefuls  Ben Carson and Donald Trump participate in the debate at the Ronald Reagan Presidential Library in Simi Valley, California, on September 16, 2015.
Republican presidential hopefuls  Ben Carson and Donald Trump participate in the debate at the Ronald Reagan Presidential Library in Simi Valley, California, on September 16, 2015.

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    New Polls: Ben Carson ahead of Trump in Iowa

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New Polls: Ben Carson ahead of Trump in Iowa

Donald Trump is behind Ben Carson in a new poll in Iowa. CNN's Sara Murray reports.

New Polls: Ben Carson ahead of Trump in Iowa

Donald Trump is behind Ben Carson in a new poll in Iowa. CNN's Sara Murray reports.