Poll: Biden, Sanders lead Trump in Iowa

Sen. Bernie SandersBernard (Bernie) SandersDemocrats' CNN town halls exposed an extreme agenda Buttigieg says he doubts Sanders can win general election Meghan McCain: Bernie Sanders supporting prisoners being able to vote 'bats**t insane' MORE (I-Vt.) and former Vice President Joe BidenJoseph (Joe) Robinette BidenButtigieg says he doubts Sanders can win general election This is the Joe Biden you rarely see Minorities, older adults push Biden to top of 2020 poll MORE both have the edge on President TrumpDonald John TrumpDemocrats' CNN town halls exposed an extreme agenda Buttigieg says he doubts Sanders can win general election Post-Mueller, Trump has a good story to tell for 2020 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 WarrenElizabeth Ann WarrenDemocrats' CNN town halls exposed an extreme agenda Minorities, older adults push Biden to top of 2020 poll The difference between good and bad tax reform MORE (D-Mass.) 51 percent to 49 percent, Sen. Cory BookerCory Anthony BookerK Street support to test Buttigieg We should welcome workers' 'powerful victory' in the Stop & Shop strike Harris adds another to her list of endorsements in South Carolina MORE (D-N.J.) 52 percent to 48 percent and Sen. Kamala HarrisKamala Devi HarrisDemocrats' CNN town halls exposed an extreme agenda The Hill's Morning Report - Will Joe Biden's unifying strategy work? K Street support to test Buttigieg 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.