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

Vermont Sen. Bernie SandersBernard (Bernie) SandersDems make history, and other takeaways from Tuesday's primaries Ellison wins Minnesota AG primary amid late domestic violence allegations Ironworker and star of viral video wins Dem primary for Speaker Ryan's seat 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 WarrenCanadian corporate tax cuts show success of strong economic policy Avenatti on 2020 campaign: 'The truth is my policy issue' Democrats embracing socialism is dangerous for America MORE (D-Mass.) and former Vice President Joe BidenJoseph (Joe) Robinette BidenTech companies earn White House praise for committing to easier health data access Biden honors Heather Heyer: She is 'in every person who stands up to reject hatred and bigotry' Avenatti on 2020 campaign: 'The truth is my policy issue' 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 ClintonDems make history, and other takeaways from Tuesday's primaries Establishment-backed Vukmir wins Wisconsin GOP Senate primary Ironworker and star of viral video wins Dem primary for Speaker Ryan's seat 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 BookerDemocrats embracing socialism is dangerous for America Kavanaugh recommended against Clinton indictment in 1998: report Kavanaugh once said president would likely have to testify before grand jury if subpoenaed: report 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.