Poll: Biden leads Democratic field by 6 points, Warren in second place

Former Vice President Joe BidenJoe BidenSchiff closes Democrats' impeachment arguments with emotional appeal to remove Trump Conservative reporter on Sanders: He's not a 'yes man' Democrats feel political momentum swinging to them on impeachment MORE remains a top choice in the 2020 presidential primary among Democratic voters, but top tier candidates are narrowing his lead according to a new poll. 

Biden maintains a 6 point advantage, with 24 percent of Democrats surveyed saying they would vote for him if the primary were held today, according to an Economist/YouGov poll

The web-based poll was conducted between June 22 and June 25, and included 1,500 U.S. adults. There is a margin of error of plus or minus 3 percent. 

Sen. Elizabeth WarrenElizabeth Ann WarrenKlobuchar plans campaign rallies across Iowa despite impeachment trial Hillicon Valley — Presented by Philip Morris International — Wyden asks NSA to investigate White House cybersecurity | Commerce withdraws Huawei rule after Pentagon objects | Warren calls on Brazil to drop Greenwald charges Warren pledges to release Trump records if elected MORE (D-Mass.) is close behind Biden, with 18 percent of the vote. Warren now polls 3 points ahead of fellow progressive candidate Sen. Bernie SandersBernie SandersSanders to Clinton: 'This is not the kind of rhetoric that we need' Conservative reporter on Sanders: He's not a 'yes man' Human Rights Campaign president rips Sanders's embrace of Rogan endorsement MORE (I-Vt.). 

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Sen. Kamala HarrisKamala Devi HarrisHarris on 2020 endorsement: 'I am not thinking about it right now' Panel: Is Kamala Harris a hypocrite for mulling a Joe Biden endorsement? The Hill's Morning Report — Dems detail case to remove Trump for abuse of power MORE (D-Calif.) ranks third among voters, with 7 percent of the vote, according to the poll. 

South Bend, Indiana, Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegPoll: 68 percent of Democrats say it 'makes no difference' if a candidate is a billionaire CNN to host two straight nights of Democratic town halls before NH primary Poll shows tight general election battle between Trump and top Democrats MORE ranked fourth in the crowded field, with 5 percent. Buttigieg has faced backlash in recent weeks in his city, and nationally, following a police shooting of a black man.

The shooting highlighted some black voters' reluctance to back Buttigieg. He received 2 percent of the black vote according to the YouGov poll. 

Rep. Tulsi GabbardTulsi GabbardJoe Rogan says he's probably voting for Bernie Sanders Gabbard tells Fox that Clinton's 'Russian asset' remark is 'taking my life away' Hillicon Valley — Presented by Philip Morris International — Bezos phone breach raises fears over Saudi hacking | Amazon seeks to halt Microsoft's work on 'war cloud' | Lawmakers unveil surveillance reform bill MORE (D-Hawaii) notably received 3 percent in the recent poll, as did former Rep. Beto O'RourkeBeto O'RourkeVeronica Escobar to give Spanish-language response to Trump State of the Union address Biden calls for revoking key online legal protection Trump mocks Booker over suspended presidential campaign MORE (D-Texas). 

Sen. Cory BookerCory Anthony BookerBlack caucus in Nevada: 'Notion that Biden has all of black vote is not true' The Hill's 12:30 Report: House managers to begin opening arguments on day two Patrick backs reparations in unveiling 'Equity Agenda for Black Americans' MORE (D-N.J.) polled at 2 percent. All other candidates polled at 1 percent or less. 

Twenty candidates will participate in two debates, ten each night, on Wednesday and Thursday in Miami.