Former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE has a small lead over Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) in the first-in-the-nation primary state of New Hampshire, but Sanders and Sen. Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Mass.) posted solid gains and are closing the gap on the front-runner, according to a new poll.

The latest Suffolk University-Boston Globe poll finds Biden at 21 percent support, followed by Sanders at 17 percent and Warren at 14 percent. No other candidate has double-digit support in the Granite State.

Sanders and Warren were the poll’s biggest gainers, picking up 5 points and 6 points, respectively, over the same poll from April.

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Sen. Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (D-Calif.) is in fourth place at 8 percent support, followed by South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE at 6 percent and Rep. Tulsi Gabbard Tulsi GabbardRepublicans call on DOJ to investigate Netflix over 'Cuties' film Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Gabbard says she 'was not invited to participate in any way' in Democratic convention MORE (D-Hawaii) at 3 percent. Sen. Cory Booker Cory Anthony Booker3 reasons why Biden is misreading the politics of court packing Bipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility MORE (D-N.J.) is at 1 percent support and former Texas Rep. Beto O’Rourke (D) registered 0 percent support.

The latest Suffolk poll shows a significantly tighter race than the same survey in late April, which found Biden in the lead at 20 percent, followed by Sanders and Buttigieg at 12 percent, Warren at 8 percent and Harris at 6 percent.

Gabbard was at 1 percent support in the prior poll and got a little bump that will push her closer to qualifying for the next debate in September in Houston.

Sanders’s support is the firmest in the field, with 48 percent of his supporters saying they will definitely support him, followed by 45 percent of Biden’s supporters and 35 percent of Warren’s supporters who said they will not change their minds.

But Warren might have the most room to grow, with 21 percent describing her as their second choice, making her the top back-up candidate in the field. Sixty percent of voters overall said they still might change their minds.

“This is an especially important number now that a number of candidates could drop out soon and shows how she could grow,” said David Paleologos, the director of the Suffolk University Political Research Center.

The survey of 500 likely Democratic primary voters in New Hampshire was conducted between Aug. 1 and 4 and has a 4.4 percentage-point margin of error.