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
Erin Burnett Out Front
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.
2:20 • Source: CNN
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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)
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Donald Trump steps up his ground game
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Green Party presidential nominee Jill Stein waits to be introduced prior to a press conference at the National Press Club August 23, 2016 in Washington, DC.
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Jill Stein raises millions for recount
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Former Democratic US Presidential candidate Hillary Clinton speaks to staff and supporters at the New Yorker hotel after her defeat in the presidential election November 9, 2016 in New York. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
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Scientists urge Clinton to call for recount
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LYNDEN, WA - MAY 07: Republican presidential candidate Donald Trump gives a speech during a rally at the The Northwest Washington Fair and Event Center on May 7, 2016 in Lynden, Washington. Trump became the Republican presumptive nominee following his landslide win in Indiana on Tuesday. (Photo by Matt Mills McKnight/Getty Images)
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Trump compares Clinton email probe to Watergate
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Members of the Secret Service rush Republican presidential candidate Donald Trump off the stage at a campaign rally in Reno, Nev., on Saturday, Nov. 5, 2016. (AP Photo/John Locher)
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Donald Trump rushed off stage by Secret Service
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Trump reads letter from Patriot's coach at rally
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US Republican presidential nominee Donald Trump speaks during rally at the Atkinson Country Club in Atkinson, New Hampshire on November 4, 2016.
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Trump on US officials: 'What a group of losers'
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Cuomo grills Lewandowski on Clinton email 'hypocrisy'
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Donald Trump thanks Anthony Wiener at rally
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Meet the other Hillary Clinton and Donald Trump
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