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 and 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.) lead the field of potential Democratic candidates for the 2020 presidential election, according to a poll of likely Iowa caucusgoers released Saturday.

Biden was the first choice of 32 percent of respondents, and Sanders, who finished second in the Democratic primary in 2016, followed with 19 percent.

"This is obviously a warm welcome to some people who are really familiar to caucusgoers in the state," said J. Ann Selzer, president of Selzer & Co., the firm that conducted the poll. "But there’s also some welcoming of newcomers who are only now starting to come to the state and get to know the people who could shape their future."

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Despite the top two candidates being veteran politicians, 36 percent of respondents said that a political "newcomer" is best suited to defeat 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, according to the Des Moines Register/CNN/Mediacom poll.

Outgoing 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), who was favored by 11 percent of respondents, may fill that desire. O'Rourke was propelled into the presidential discussion after a close Senate race loss to 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).

He has met with a number of prominent Democrats in recent weeks, including former President Obama and the Rev. Al Sharpton.

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 (D-Mass.) was the only other candidate to receive more than 5 percent of support, with 8 percent.

Democratic Sens. 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 (Calif.), 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.) and Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (Minn.), all of whom have visited Iowa, were the first choices for 5, 4, and 3 percent of those polled, respectively. Former New York City Mayor Michael Bloomberg also polled at 3 percent.

Biden and Sanders also had the highest name recognition among those included in the survey, with only 4 percent of respondents having no opinion them.

Warren had the next highest share of people with a position on her with 84 percent, followed by Bloomberg at 71, O’Rourke at 64, Booker at 61 and Harris at 59 percent.

So far, none of the candidates have announced a campaign.

The poll asked likely Democratic caucusgoers in Iowa, the first state to hold caucuses, which candidate they would prefer out of a list of 20. The poll surveyed 455 people between Dec. 10-13, with a margin of error of 4.6 points.

The results of the Iowa poll lines up with a national survey on potential Democratic nominees from Friday that had Biden, with 30 percent, Sanders, with 14 percent, and O'Rourke, with 9 percent, as the three front-runners.