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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)
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)

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    Donald Trump steps up his ground game

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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.

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.