Bernie Sanders leads Joe Biden in New Hampshire, according to a new Franklin Pierce University-Boston Herald survey released Wednesday.

The poll shows that 29 percent of likely Democratic voters in the first-in-the-nation primary state said they support the Vermont senator, while 21 percent are backing Biden. Elizabeth Warren received 17 percent.

The survey of 425 likely Democratic voters was completed from Sept. 4-10, and has a margin of error of plus or minus 4.8 percentage points.

Among the lower-polling candidates, 6 percent said they are behind Sen. Kamala Harris, and 5 percent are with Andrew Yang. Pete Buttigieg is in sixth place with 4 percent.

New Hampshire polling is notoriously volatile, and recent surveys in the state show a jumble among the top three candidates. A CBS News-YouGov poll released this week showed a statistical tie among Sanders, Warren and Biden in New Hampshire, with Warren with 27 percent, Biden with 26, and Sanders 25.

Thousands of New Hampshire Democrats flocked to the state party's annual convention last weekend, where 19 presidential candidates gave speeches and tried to woo voters. Both Warren and Sanders received enthusiastic receptions the crowd. Biden's speech was met with a more tepid response, and several party insiders voiced concerns about his candidacy.

Sanders and Warren, two senators who hail from neighboring states, both carry high expectations in New Hampshire. Sanders won New Hampshire by 22 points in his first bid for the White House in 2016.