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HOLDERNESS, NH - FEBRUARY 07:  Republican presidential candidate Donald Trump speaks during a campaign rally at  Plymouth State University on February 7, 2016 in Holderness, New Hampshire. (Photo by Joe Raedle/Getty Images)

Donald Trump steps up his ground game

As Donald Trump's supporters wait in frigid temperatures to see him, the Republican front-runner has increased his campaign stops in New Hampshire. CNN's Sara Murray reports.

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