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Poll: Trump leads top 2020 Democrats in Iowa

The top Democratic presidential candidates trail President Trump in Iowa, according to a new poll.

Trump is leading all of his potential challengers in head-to-head matchups, but South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegJuan Williams: Clyburn is my choice as politician of the year 'Biff is president': Michael J. Fox says Trump has played on 'every worst instinct in mankind' Buttigieg: Denying Biden intelligence briefings is about protecting Trump's 'ego' MORE fared the best. The mayor is in a statistical dead-heat with Trump based on an Emerson poll released Tuesday.

Trump has a slim 1 percentage point lead over Buttigieg — 46 percent to 45 percent — that's within the poll's 3 point margin of error.

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Former Vice President Joe BidenJoe BidenLawsuit alleges 200K Georgia voters were wrongly purged from registration list GOP lawmaker blasts incoming freshman over allegations of presidential voter fraud Haaland has competition to be first Native American to lead Interior  MORE is the next closest Democrat, trailing Trump by 4 points. Trump has 49 percent support to Biden's 45 percent.

The president leads both Sens. Elizabeth WarrenElizabeth WarrenDespite veto threat, Congress presses ahead on defense bill Overnight Defense: Defense bill moving forward despite Trump veto threat over tech fight | Government funding bill hits snag | Top general talks Afghanistan, Pentagon budget Katie Porter in heated exchange with Mnuchin: 'You're play-acting to be a lawyer' MORE (D-Mass.) and Bernie SandersBernie SandersFormer Sanders press secretary: 'Principal concern' of Biden appointments should be policy DeVos knocks free college push as 'socialist takeover of higher education' The Hill's 12:30 Report — Presented by Capital One — Giuliani denies discussing preemptive pardon with Trump MORE (I-Vt.) by 7 points, with Trump at 50 percent support to their 43 percent.

Trump has extended his lead over Democrats since a March poll by Emerson. Sanders bested Trump by 2 points at the time, and the president led Biden and Warren by just 2 points. The matchup results in March were also within the poll’s margin of error.

Despite being the strongest candidate against Trump in the most recent head-to-head matchups, Buttigieg trails both Biden and Sanders in Iowa.

The two Democratic front-runners in the poll are neck and neck for the top spot, with Biden at 23 percent and Sanders at 22 percent. Buttigieg was the favorite for 18 percent of voters polled.

Warren has dropped to fourth in the Emerson poll, at 12 percent support. 

The poll was conducted Dec. 7-10 among 1,043 voters.