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    Donald Trump reacts to Carson taking the lead in Iowa

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Donald Trump reacts to Carson taking the lead in Iowa

Donald Trump says he will have to "work a little bit harder in Iowa" to catch Ben Carson, who moved ahead of the real estate mogul in two Republican polls this week.

Donald Trump reacts to Carson taking the lead in Iowa

Donald Trump says he will have to "work a little bit harder in Iowa" to catch Ben Carson, who moved ahead of the real estate mogul in two Republican polls this week.