Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.) and former Vice President Joe Biden Joe BidenOmar fires back at Trump over rally remarks: 'This is my country' Trump mocks Biden appearance, mask use ahead of first debate Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE both have the edge on President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE in Iowa in a general election match-up, according to a new Emerson poll.

Biden leads Trump 53 percent to 47 percent in a head-to-head match-up, according to the poll, while Sanders leads Trump 51 percent to 49 percent.

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The poll found Trump ahead of other Democratic contenders. He led Sen. Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.) 51 percent to 49 percent, 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 (D-N.J.) 52 percent to 48 percent and Sen. Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (D-Calif.) 54 percent to 46 percent.

Adding Starbucks founder Howard Schultz, who has floated an independent bid, to the match-up hurt both Trump and Warren in a head-to-head, according to the poll. In a three-way race, Trump was at 48 percent, with Warren at 45 percent and Schultz at 7 percent.

Schultz’s entry into the race would also cost Sanders his general election advantage, according to the poll, which put a three-way match-up at 47 percent for Trump, 45 percent for Sanders and 8 percent for Schultz.

The Emerson survey, released Sunday, also found South Bend, Ind., Mayor Pete Buttigieg surging to third place among preferred Democratic candidates, with 11 percent of likely Iowa caucusgoers polled selecting Buttigieg as their chosen 2020 nominee.

The poll surveyed 707 adults between March 21 and 24. It had a margin of error of 3.6 percentage points.

-- Updated on March 25 at 2:54 p.m.