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

Vermont Sen. Bernie SandersBernard (Bernie) SandersA case for open borders and how it can boost the world economy Sen. Sanders: 'Hypocrite' Trump rants against undocumented immigrants, but hires them at his properties On The Money — Sponsored by Prudential — Trump floats tariffs on European cars | Nikki Haley slams UN report on US poverty | Will tax law help GOP? It's a mystery 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 WarrenMulvaney aims to cement CFPB legacy by ensuring successor's confirmation Trump calls Nevada Dem Senate candidate 'Wacky Jacky,' renews 'Pocahontas' jab at Warren On The Money — Sponsored by Prudential — Trump floats tariffs on European cars | Nikki Haley slams UN report on US poverty | Will tax law help GOP? It's a mystery MORE (D-Mass.) and former Vice President Joe BidenJoseph (Joe) Robinette BidenBiden: Trump family separation policy could make the US a pariah Elizabeth Warren can unify Democrats and take back the White House Giuliani doubles down on Biden comments: 'I meant that he’s dumb' 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 ClintonColorado governor teases possible presidential run Mueller asks judge for September sentencing for Papadopoulos House Judiciary Committee subpoenas FBI agent who sent anti-Trump texts 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 BookerDem presidential hopefuls seize on Trump border policy To strengthen our democracy, we need to remove obstacles that keep students from voting Members of Congress demand new federal gender pay audit 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.