Poll: Biden, Sanders lead Trump in Iowa

Sen. Bernie SandersBernie SandersWarren says making Israel aid conditional on settlement building is 'on the table' Warren says she will unveil plan to finance 'Medicare for All' Ocasio-Cortez says endorsing Sanders early is 'the most authentic decision' she could make MORE (I-Vt.) and former Vice President Joe BidenJoe BidenZuckerberg launches public defense of Facebook as attacks mount Graham: 'Stupid' for Trump to ask China to investigate Biden Romney: Republicans don't criticize Trump because they fear it will help Warren MORE both have the edge on President TrumpDonald John TrumpZuckerberg launches public defense of Facebook as attacks mount Trump leaning toward keeping a couple hundred troops in eastern Syria: report Warren says making Israel aid conditional on settlement building is 'on the table' 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 WarrenZuckerberg launches public defense of Facebook as attacks mount Warren, Yang fight over automation divides experts Warren says making Israel aid conditional on settlement building is 'on the table' MORE (D-Mass.) 51 percent to 49 percent, Sen. Cory BookerCory Anthony BookerWarren says she will unveil plan to finance 'Medicare for All' Gabbard hits back at 'queen of warmongers' Clinton The Hill's Campaign Report: Biden camp faces new challenges MORE (D-N.J.) 52 percent to 48 percent and Sen. Kamala HarrisKamala Devi HarrisWarren says she will unveil plan to finance 'Medicare for All' Kamala Harris reacts to supporter who got tattoo of her handwriting Even with likely Trump impeachment, Democrats face uphill climb to win presidency 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.