Former Vice President Joe Biden Joe BidenJoe Biden looks to expand election battleground into Trump country Trump puts Supreme Court fight at center of Ohio rally Special counsel investigating DeVos for potential Hatch Act violation: report MORE leads the field of potential Democratic presidential candidates by double digits among likely Iowa caucusgoers, according to a new poll.

An Emerson College poll published Saturday found that Biden has the support of 29 percent of the planned caucusgoers surveyed, well ahead of Sen. Kamala Harris Kamala HarrisJoe Biden looks to expand election battleground into Trump country Fox's Napolitano: Supreme Court confirmation hearings will be 'World War III of political battles' Rush Limbaugh encourages Senate to skip hearings for Trump's SCOTUS nominee MORE (D-Calif.), who has the backing of 18 percent of likely caucusgoers polled.

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Biden has not yet announced a bid for president but has said he is likely to make the decision shortly.

The poll was based on interviews with 260 likely caucusgoers and has a margin of error of plus or minus 6 percentage points. The interviews were conducted Jan. 30-Feb. 2.

Following Biden and Harris in the poll is Sen. Bernie Sanders Bernie SandersJacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee Trump campaign plays up Biden's skills ahead of Cleveland debate: 'He's actually quite good' Young voters backing Biden by 2:1 margin: poll MORE (I-Vt.) with 15 percent and Sen. Elizabeth Warren (D-Mass.) with 11 percent. No other candidate received more than 6 percent of support.

Sanders, who ran against Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE in the 2016 Democratic Primary, also has not yet announced a White House bid.

Harris announced last month that she is running for the Democratic nomination, while Warren launched an exploratory committee in December and is expected to soon formally launch her campaign.

The Emerson College poll also found that Biden is the only Democratic front-runner who would defeat President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE in a head-to-head match-up among Iowa voters.

The poll shows 51 percent of respondents backing Biden and 49 percent supporting Trump.

That subset of the poll was based on interviews with 831 registered voters Jan. 30-Feb. 2 and has a margin of error of plus or minus 3.4 percentage points.