Sen. Bernie Sanders (I-Vt.) leads the Democratic presidential field in New Hampshire with 21 percent in a Gravis Marketing poll released Tuesday.

Sanders is followed by former Vice President Joe Biden with 15 percent and by Sen. Elizabeth Warren (D-Mass.) at 12 percent.

The poll stands in contrast from the most recent polls in New Hampshire compiled by RealClearPolitics, which have showed Biden leading in the critical primary state, followed by Sanders.

Gravis Marketing polled 250 Democratic primary voters on Aug. 2-6 using interactive voice responses and an online panel of cell phone users. The primary question had a margin of error of 6.2 percentage points.

"It is important to note that Sen. Sanders won the New Hampshire Democratic Primary in 2016," Doug Kaplan, president of Gravis Marketing, said in a statement.

"However, it is unlikely that Sen. Sanders will have a repeat of his 2016 performance in the state due to the number of candidates in the race this time."

The Gravis poll found South Bend, Ind., Mayor Pete Buttigieg and Sen. Kamala Harris (D-Calif.) rounding out the top five, with 8 percent and 7 percent, respectively.

The poll also found President Trump losing to every candidate in the top five in the Granite State in a hypothetical match-up among registered voters, with Biden beating him 53 percent to 40 percent and Sanders beating him 51 percent to 41 percent.

Warren, meanwhile, leads Trump 49 percent to 44 percent, while Buttigieg beats him 49 percent to 42 percent and Harris leads him 47 percent to 44 percent. Democratic nominee Hillary Clinton beat Trump by fewer than 0.5 points in the 2016 presidential election.

The poll for the general questions on Trump was conducted through a random survey of 505 individuals in New Hampshire and has a margin of error of 4.4 percentage points.