Poll: Biden, Sanders lead Trump in Iowa

Sen. Bernie SandersBernie SandersTrump complains of 'fake polls' after surveys show him trailing multiple Democratic candidates The Hill's Morning Report - Presented by JUUL Labs - Trump attack on progressive Dems draws sharp rebuke Judd Gregg: Counting the costs of Democrats' desires MORE (I-Vt.) and former Vice President Joe BidenJoe BidenTrump complains of 'fake polls' after surveys show him trailing multiple Democratic candidates Biden pitches new subsidies, public option in health care plan The Hill's Morning Report - Presented by JUUL Labs - Trump attack on progressive Dems draws sharp rebuke MORE both have the edge on President TrumpDonald John TrumpCNN's Camerota clashes with Trump's immigration head over president's tweet LA Times editorial board labels Trump 'Bigot-in-Chief' Trump complains of 'fake polls' after surveys show him trailing multiple Democratic candidates 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 WarrenTrump complains of 'fake polls' after surveys show him trailing multiple Democratic candidates Amazon warehouse workers strike on Prime Day Elizabeth Warren backs Amazon workers striking on Prime Day MORE (D-Mass.) 51 percent to 49 percent, Sen. Cory BookerCory Anthony BookerBooker prison reform bill would give older prisoners a 'second look' Booker to unveil plan for older Americans' long-term health care: report Judd Gregg: Counting the costs of Democrats' desires MORE (D-N.J.) 52 percent to 48 percent and Sen. Kamala HarrisKamala Devi HarrisTrump complains of 'fake polls' after surveys show him trailing multiple Democratic candidates Judd Gregg: Counting the costs of Democrats' desires Buttigieg: 'Medicare for all,' free college tuition are 'questionable on their merits' 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.