Republican front-runner Donald TrumpDonald TrumpThird-party candidate McMullin: We can win Idaho and Wyoming Pence's plane skids off runway in New York Trump lashes out over 'illegal' Access Hollywood tapes MORE and Democratic presidential candidate Bernie SandersBernie SandersPicking longtime fixer as chief of staff proves Clinton hasn't changed The Trail 2016: Wikissues Brent Budowsky: An epic battle for the future of Congress MORE are seeing increased support atop their parties' respective fields in New Hampshire, according to a new Franklin Pierce University-Boston Herald poll.
Trump holds a 25-point lead over his closest rival, Ted CruzTed CruzDemocrats pounce on Cruz's Supreme Court comments Brent Budowsky: An epic battle for the future of Congress Cruz: Precedent exists for keeping Supreme Court short-staffed MORE, according to Sunday's poll. He has 38 percent of support among likely GOP primary voters, with Cruz taking only 13 percent. Former Florida Gov. Jeb Bush and Florida Sen. Marco RubioMarco RubioObama plans 'aggressive' blitz for Clinton in campaign's final days One way or another, 2016 was all about Donald Trump's hands Poll: Clinton has 4-point lead over Trump in Florida MORE follow with 10 percent. Ohio Gov. John Kasich comes in fifth place with 8 percent.
Trump had 33 percent support in a similar poll a week ago.
But 44 percent of Republican primary voters said in the poll they could still change their minds about their choice of candidate. Still, 57 percent of Republican primary voters in New Hampshire believe Trump will be the nominee, according to the poll.
In the Democratic race, Sanders hold a 20-point lead over Hillary ClintonHillary Rodham ClintonThird-party candidate McMullin: We can win Idaho and Wyoming Clinton, Kaine raise over 0M in October Local leaders turning the heat up on Citizens United MORE among likely Granite State primary voters, according to the poll. Sanders has 57 percent support over Clinton's 37 percent. Sanders's support is is 2 points higher than last week's poll.
About 78 percent of likely primary voters said they won't be changing their minds about their decision.
The polls, conducted between Jan. 26-30, have a 4.7 percent margin of error for Republicans and 4.9 percent margi of error for Democrats.
Sanders and Trump also hold large leads in the RealClearPolitics average of polls in New Hampshire. Trump has an 18.2 point lead, with 31.4 percent support, over John Kasich, who has only 13.2 percent. Sanders holds a 14.3 point lead over Clinton in the RealClearPolitics average, taking 53.7 percent of the vote compared to Clinton who only has 39.4 percent.