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

Former Vice President Joe BidenJoe BidenDemocrats worry they don't have right candidate to beat Trump Trump threatening to fire Mulvaney: report Giuliani pens op-ed slamming 'unprecedented' impeachment inquiry 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 WarrenDemocrats worry they don't have right candidate to beat Trump Overnight Energy: BLM staff face choice of relocation or resignation as agency moves | Trump says he's 'very much into climate' | EPA rule would expand limits on scientific studies Krystal Ball credits Gabbard's upswing in 2020 race to 'feckless' Democratic establishment 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 SandersDemocrats worry they don't have right candidate to beat Trump Overnight Health Care: Top health official defends contract payments to Trump allies | Vaping advocates confident Trump will turn from flavor ban | Sanders gets endorsement from nurses union Krystal Ball credits Gabbard's upswing in 2020 race to 'feckless' Democratic establishment MORE (I-Vt.). 

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Sen. Kamala HarrisKamala Devi HarrisOutsider candidates outpoll insider candidates Poll: Buttigieg leads Democratic field in Iowa Press: Another billionaire need not apply 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 ButtigiegDemocrats worry they don't have right candidate to beat Trump Saagar Enjeti rips Buttigieg for praising Obama after misquote Krystal Ball credits Gabbard's upswing in 2020 race to 'feckless' Democratic establishment 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 GabbardOutsider candidates outpoll insider candidates Krystal Ball: Tulsi Gabbard surges, is she the most electable? New Quinnipiac poll finds Biden leading in New Hampshire MORE (D-Hawaii) notably received 3 percent in the recent poll, as did former Rep. Beto O'RourkeBeto O'RourkeO'Rourke says he 'absolutely' plans to stay in politics Krystal Ball: Buttigieg is 'the boomer candidate' Language is a weapon in political warfare — if the media play along MORE (D-Texas). 

Sen. Cory BookerCory Anthony BookerOutsider candidates outpoll insider candidates The Hill's Campaign Report: Bloomberg looks to upend Democratic race Poll: Biden support hits record low of 26 percent 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.