Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) and former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE are now statistically tied in New Hampshire among registered voters as they fight for the 2020 Democratic presidential nomination, according to a new online poll.

A HarrisX/No Labels survey released Thursday found that 22 percent of likely Democratic primary voters said they support Biden, while 21 back Sanders, putting the two White House hopefuls well within the poll's margin of error.

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Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) polls at 15 percent, putting her third. They are the only three candidates with double-digit support in the Granite State.

Warren is the leading second choice for respondents at 16 percent, followed by Sanders and Biden at 12 percent each.

Much of the New Hampshire primary electorate is still undecided, according to the poll, with 14 percent unsure of which candidate they support and 76 percent saying that their top choice could change before election day.

The survey was released just hours ahead of the third Democratic primary debate, set to be held in Houston. The showdown marks the first time that Biden, Sanders and Warren have all shared a debate stage together.

The HarrisX/No Labels survey contacted 595 registered Democratic and Independent voters in New Hampshire. The poll's margin of error is plus or minus 3 percentage points.