Former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE has the best favorability rating among a group of leading potential Democratic presidential contenders, according to a new poll.

The Quinnipiac University poll released Wednesday showed that 53 percent of respondents have a favorable view of Biden, compared with 33 percent who have an unfavorable view.

Biden is the only possible 2020 candidate in the poll who has a favorability rating better than 50 percent.

Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE, the 2016 Democratic presidential nominee, has the highest unfavorable score among the candidates, with 61 percent of respondents saying they view her negatively.

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Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.), Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas) and Sen. Sherrod Brown Sherrod Campbell BrownHarris faces pivotal moment with Supreme Court battle Remote work poses state tax challenges Senate Democrats release report alleging Trump admin undermined fair housing policies MORE (D-Ohio) are the only candidates other than Biden included in the poll whom more voters view favorably than unfavorably.

“For Democrats gearing up for 2020, it’s Biden and Bernie, with Beto looking for a foothold and Hillary wondering if the train has finally left the station,” Tim Malloy, assistant director of the Quinnipiac University Poll, said in a statement.

The poll's results are based on surveys of 1,147 voters, with a margin of error of 3.4 percentage points.

For Sanders, 44 percent of poll voters view him favorably and 42 percent view him unfavorably.

A majority of voters — 55 percent — said they don't know enough to have formed an opinion about O'Rourke, who last month lost a Senate bid against Sen. Ted Cruz Rafael (Ted) Edward CruzCruz blocks amended resolution honoring Ginsburg over language about her dying wish Trump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP MORE (R-Texas). But of those who do, 24 percent view O'Rourke favorably and 20 percent view him unfavorably, the poll found.

A wide majority of voters also don't know much about Brown, with 77 percent saying they haven't heard enough about him. Twelve percent of voters say they view him favorably and 9 percent say they view him unfavorably.

Democrats with net-negative favorability ratings include Sen. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (N.J.), former New York Mayor Michael Bloomberg, Sen. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (N.Y.) and Sen. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (Mass.).

Respondents were nearly split on Sen. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE, another leading contender, with 20 percent saying they view her favorably and 22 percent viewing her unfavorably. The remaining voters said they don't know enough about her to have an opinion.

The poll also found that President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE has a negative approval rating, with 56 percent of voters viewing him unfavorably and 40 percent viewing him favorably.