Poll: Biden leads 2020 Dem field by double digits followed by Sanders, O'Rourke

Former Vice President Joe BidenJoe BidenBiden compares Trump to George Wallace Sanders unveils plan to guarantee the 'right to a secure retirement' CNN Democratic debate drawing finishes third in cable news ratings race MORE holds a double-digit lead over the rest of the 2020 Democratic field in a new poll released Thursday.

In the Quinnipiac University poll, Biden heads the pack with the support of 29 percent of registered Democrats and voters who lean to the left, while Sen. Bernie SandersBernie SandersGabbard arrives in Puerto Rico to 'show support' amid street protests Democratic strategist predicts most 2020 candidates will drop out in late fall Sanders unveils plan to guarantee the 'right to a secure retirement' MORE (I-Vt.) holds a second-place ranking with the backing of 19 percent of those surveyed.

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Former Rep. Beto O'RourkeBeto O'RourkeThe Hill's Campaign Report: Second debate lineups set up high-profile clash Biden, Harris set for second Democratic debate showdown 2020 Democrats react to 'send her back' chants at Trump rally MORE (D-Texas), who announced his bid for the presidency this month following his defeat to Sen. Ted CruzRafael (Ted) Edward CruzHow to reduce Europe's dependence on Russian energy Cruz calls for 'every penny' of El Chapo's criminal enterprise to be used for Trump's wall after sentencing Conservatives defend Chris Pratt for wearing 'Don't Tread On Me' T-shirt MORE (R-Texas) in November's midterm elections, sits in third place in the poll with 12 percent, while Sen. Kamala HarrisKamala Devi HarrisWhat to expect when Mueller testifies: Not much Biden compares Trump to George Wallace CNN Democratic debate drawing finishes third in cable news ratings race MORE (D-Calif.) is in fourth with the support of 8 percent of respondents.

Meanwhile, South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegDemocratic strategist predicts most 2020 candidates will drop out in late fall The Hill's 12:30 Report: Trump hits media over 'send her back' coverage The Hill's Campaign Report: Second debate lineups set up high-profile clash MORE (D) has surged in the polls since the announcement of his exploratory committee and was tied for fifth place with Sen. Elizabeth WarrenElizabeth Ann WarrenJulián Castro is behind in the polls, but he's finding a niche Gabbard arrives in Puerto Rico to 'show support' amid street protests Democratic strategist predicts most 2020 candidates will drop out in late fall MORE (D-Mass.), each earning the support of 4 percent of voters.

The poll provides Democrats with some other data to be optimistic about: Fifty-three percent of those surveyed said that they would not support President TrumpDonald John TrumpUS-Saudi Arabia policy needs a dose of 'realpolitik' Trump talks to Swedish leader about rapper A$AP Rocky, offers to vouch for his bail Matt Gaetz ahead of Mueller hearing: 'We are going to reelect the president' MORE in the 2020 election regardless of which Democrat wins the primary.

"Hungry for a candidate to take on President Donald Trump, Democrats and Democratic leaners put the three B's, Biden, Bernie and Beto, at the top in a race where age, race and gender take a back seat to electability and shared views," Tim Malloy, the poll's assistant director, said in the press release.

Quinnipiac's survey contacted 1,358 registered voters and has a margin of error of plus or minus 3.3 percentage points. For Democrats and Democratic-leaning voters samples, the margin of error is plus or minus 5.1 percentage points.