Democratic presidential hopeful Bernie Sanders has rocketed past longtime front-runner Hillary Clinton in New Hampshire, a stunning turn in a race once considered a lock for the former secretary of state, a new Franklin Pierce University/Boston Herald poll shows.

Sanders leads Clinton 44-37 percent among likely Democratic primary voters, the first time the heavily favored Clinton has trailed in the 2016 primary campaign, according to the poll of 442 Granite-Staters.

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Vice President Joe Biden got 9 percent support in the test primary match-up. The other announced Democrats in the race, former Maryland Gov. Martin O’Malley, former Rhode Island Gov. Lincoln Chafee and former Virginia Gov. Jim Webb, barely register at 1 percent or below.

The live interview phone poll was conducted Aug. 7-10 and has a margin of error of plus or minus 4.7 percentage points.

Clinton is still viewed overwhelmingly by voters as the likely Democratic nominee, but the results suggest she faces an unexpectedly difficult fight to prevent an embarrassing opening loss in the first-in-the-nation primary.

The Franklin Pierce/Herald poll shows that most New Hampshire Democrats are lukewarm to Clinton, despite her campaign’s concerted effort to soften her image and connect with voters.

Just 35 percent of likely primary voters say they are “excited” about Clinton’s campaign, according to the poll. And 51 percent of voters say that while they could support her, they aren’t enthusiastic about her White House bid.

And while 80 percent of likely Granite State Democrats view her favorably, just 38 percent of those say they have a “very” favorable impression.

Sanders’ rise has been meteoric. The socialist senator trailed Clinton by a 44-8 margin in a Franklin Pierce/Herald poll in March.

More than half of New Hampshire’s likely Democratic primary voters say they view Sanders “very” favorably, an indication of the excitement the Vermont senator has generated among his mostly liberal supporters.

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But while Sanders has surged ahead in New Hampshire, he does face what appears to be an electability problem, even among his staunch supporters.

Just 11 percent of likely Democratic voters picked him over Clinton to win the nomination, while 65 percent said she would emerge as the party’s general election candidate.

The poll also shows there is some appetite among New Hampshire Democrats for Biden to jump into the field. Forty-six percent of likely primary voters say Biden should launch a White House campaign, while 42 percent say he should stay out. Biden’s favorability numbers have also increased by 14 points since March.