Sanders leads potential 2020 Dem candidates in NH poll
© Greg Nash

Vermont Sen. Bernie SandersBernard (Bernie) SandersBiden: Trump administration 'coddles autocrats and dictators' Warren and Sanders question Amazon CEO over Whole Foods anti-union video Dem lawmaker to Saudis: Take your oil and shove it MORE (I) leads a field of potential Democratic presidential contenders for the 2020 New Hampshire primary, according to a new poll of likely Democratic voters.

A University of New Hampshire poll released Wednesday shows Sanders with 31 percent support in a hypothetical matchup against other potential 2020 challengers, including Sen. Elizabeth WarrenElizabeth Ann WarrenWarren and Sanders question Amazon CEO over Whole Foods anti-union video Senate Dems ask Trump to disclose financial ties to Saudi Arabia Republicans should prepare for Nancy Pelosi to wield the gavel MORE (D-Mass.) and former Vice President Joe BidenJoseph (Joe) Robinette BidenBiden: I hope Dems don't move to impeach Trump if they retake the House Biden: Trump administration 'coddles autocrats and dictators' Election Countdown: O'Rourke goes on the attack | Takeaways from fiery second Texas Senate debate | Heitkamp apologizes for ad misidentifying abuse victims | Trump Jr. to rally for Manchin challenger | Rick Scott leaves trail to deal with hurricane damage MORE.

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Sanders won the 2016 New Hampshire Democratic primary with 60 percent of the vote, defeating former Secretary of State Hillary ClintonHillary Diane Rodham ClintonMueller's team asking Manafort about Roger Stone: report O'Rourke targets Cruz with several attack ads a day after debate GOP pollster says polls didn't pick up on movement in week before 2016 election MORE, who eventually won the Democratic nomination for president.

In the poll, Biden came in second place with 24 percent support, while Warren took third place with 13 percent. Other potential challengers, including Sen. Cory BookerCory Anthony BookerSenate Dems ask Trump to disclose financial ties to Saudi Arabia Biden: ‘Totally legitimate’ to question age if he runs in 2020 On The Money: Deficit hits six-year high of 9 billion | Yellen says Trump attacks threaten Fed | Affordable housing set for spotlight in 2020 race MORE (D-N.J.), former Maryland Gov. Martin O'Malley and Facebook CEO Mark Zuckerberg, all failed to break 10 percent.

When voters were not given a list of potential options, the differences were more stark. About 15 percent of likely primary voters mentioned Sanders as a candidate they could support, compared to just 5 percent for Biden and Clinton. Four percent mentioned Warren.

President Trump's support is also historically weak in the poll. Just under half of likely Republican primary voters said they planned to vote for Trump in the 2020 GOP primary, compared to 64 percent of Democrats who said the same about former President Obama in the same poll taken in October 2009.

The New Hampshire University poll surveyed 573 adults in the state between Oct. 3-15. It carries a margin of error of 4.1 percentage points.