What conclusions one can draw from the Fox poll are uncertain. Fifty-five percent of GOP primary voters surveyed said that they could change their mind before the primary.
The Fox News poll was conducted from November 15 to 17 by telephone and live interviewers from Anderson Robbins Research and Shaw and Co. Research.
The results of the poll mirror that of another poll released Wednesday, one conducted by Boston NPR station WBUR. In that poll, also surveying Republican primary voters in New Hampshire, Trump received 23% of Republican primary voters. Rubio tied with Carson for second place with 13%.
Though Carson remains one of the most favorable candidates in the GOP race, Carson's favorability rating in New Hampshire has notably dipped.
The percentage of GOP voters in the state who view him favorably dropped from 63% in early October to 55% now, giving Rubio a slight edge as the most likable candidate among likely New Hampshire primary voters.
See photos of Carson's campaign:
Ben Carson on the campaign trail
Ben Carson is fading fast in the latest Fox News New Hampshire poll
MT. AYR, IA - JANUARY 22 : Republican presidential candidate Ben Carson is introduced during his 'Trust in God Townhall' campaign stop January 22, 2016 in Mt. Ayr, Iowa. Carson, who is seeking the nomination from the Republican Party is on the presidential campaign trail across Iowa ahead of the Iowa Caucus taking place February 1. (Photo by Joshua Lott/Getty Images)
Ben Carson, 2016 Republican presidential candidate, speaks during a Liberty University Convocation in Lynchburg, Virginia, U.S., on Wednesday, Nov. 11, 2015. As retired neurosurgeon Carson has risen in the polls, media reports have revisited his accounts of acts of violence as a child, a key part of the redemption story he discusses on the campaign trail. Photographer: Andrew Harrer/Bloomberg via Getty Images
PALM BEACH GARDENS, FL - NOVEMBER 06: Republican presidential candidate Ben Carson speaks to the media before speaking at a gala for the Black Republican Caucus of South Florida at PGA National Resort on November 6, 2015 in Palm Beach, Florida. Carson has come under media scrutiny for possibly exaggerating his background and other statements he has made recently. (Photo by Joe Raedle/Getty Images)
DES MOINES, IA - AUGUST 16: Republican presidential hopeful Ben Carson (L) eats a piece of pizza while touring the Iowa State Fair on August 16, 2015 in Des Moines, Iowa. Presidential candidates are addressing attendees at the Iowa State Fair on the Des Moines Register Presidential Soapbox stage and touring the fairgrounds. The State Fair runs through August 23. (Photo by Justin Sullivan/Getty Images)
LAKEWOOD, CO - OCTOBER 29: Republican presidential candidate Ben Carson speaks during a news conference before a campaign event at Colorado Christian University on October 29, 2015 in Lakewood, Colorado. Ben Carson was back on the campaign trail a day after the third republican debate held at the University of Colorado Boulder. (Photo by Justin Sullivan/Getty Images)
WASHINGTON, DC - SEPTEMBER 25: Scenes around the the Value Voters Summit on September 25, 2015 in Washington DC. Republican presidential candidate Ben Carson takes the stage at the event. Dr Carson speaks to the media after the speach. (Photos by Charles Ommanney/The Washington Post via Getty Images)
Attendees wait for Ben Carson, 2016 Republican presidential candidate, not pictured, to arrive during a campaign stop at the birthplace of the Michigan Republican Party in Jackson, Michigan, U.S., on Wednesday, Sept. 23, 2015. Carson, the third candidate in the Republican race to have never held elected office, saw his numbers drop following the debate last week. Photographer: Luke Sharrett/Bloomberg via Getty Images
Ben Carson, 2016 Republican presidential candidate, listens as he attends a service at Maple Street Missionary Baptist Church in Des Moines, Iowa, U.S., on Sunday, Aug. 16, 2015. Carson will be speaking at the Iowa State Fair, which is expected to host 18 presidential candidates and runs until Aug. 23. Photographer: Daniel Acker/Bloomberg via Getty Images
CLEVELAND, OH - AUGUST 06: Republican presidential candidate Ben Carson participates in the first prime-time presidential debate hosted by FOX News and Facebook at the Quicken Loans Arena August 6, 2015 in Cleveland, Ohio. The top-ten GOP candidates were selected to participate in the debate based on their rank in an average of the five most recent national political polls. (Photo by Chip Somodevilla/Getty Images)
Ben Carson, 2016 Republican presidential candidate, eats a slice of pizza as he tours the Iowa State Fair in Des Moines, Iowa, U.S., on Sunday, Aug. 16, 2015. In a Sunday interview with Fox News, Carson doubled down on his assertion that a speech given by President Barack Obama intended to sell the American public on his nuclear deal with Iran contained 'coded innuendos employing standard anti-Semitic themes.' Photographer: Daniel Acker/Bloomberg via Getty Images
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Many polling experts have speculated that Carson's support among Republicans may mirror the boom-and-bust arcs of previous insurgent candidates, and could be a figment of the inability of early polling to predict actual results several months out.
"That softness of support for Carson might put him in a similar category as Michele Bachmann, Newt Gingrich, and Rick Santorum, all of whom rose to similar levels of support for several months, but then lost that support by the time voting started," Princeton polling expert Sam Wang told Business Insider recently. "Carson's rise has not yet lasted longer than they did."
Added statistics guru Nate Silver, founder of the site FiveThirtyEight, in a discussion at Columbia University last weekend: "The polling doesn't become highly accurate until a couple weeks before Iowa, sometimes or after Iowa, really."
But wary of Trump's resilience in the polls and the failure of almost every establishment-oriented candidate to gain traction, polling analysts also caution ruling out either candidate.
"The risk of something unusual happening is higher than usual. I think not as high as you'd gather from the press. I'd say the chance of Trump or Carson winning is probably 10% or lower, but still, you know, I'm not going to sit here confidently and say, 'Oh, it's impossible for them to win,' because the GOP may be a bit different than usual," Silver said.
Added Wang: "The hardening of support for Trump is extremely interesting and suggests that he might have staying power. His numbers have also lasted longer than those transient candidates from 2012. That puts him in a category more like Pat Buchanan in 1992 and 1996, who didn't get the nomination, but was a major force within the Republican Party."
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Ben Carson facts you should know
Ben Carson is fading fast in the latest Fox News New Hampshire poll
1. He is a weekly opinion columnist for The Washington Times.
(Photo by: William B. Plowman/NBC/NBC NewsWire via Getty Images)
2. He is a member of the Seventh-day Adventist Church, and his father was a minister.
(Photo by Bill Pugliano/Getty Images)
10. He and his wife started a scholarship fund called "Carson scholars fund" in 1994 which has so far awarded 6,700 scholarships to kids for "academic excellence and humanitarian qualities."