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

Former Vice President Joe BidenJoe BidenUkrainian official denies Trump pressured president Trump goes after New York Times, Washington Post: 'They have gone totally CRAZY!!!!' Warren overtakes Biden in Iowa for first time: poll 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 WarrenWarren overtakes Biden in Iowa for first time: poll Warren avoids attacks while building momentum Sanders unveils plan to eliminate Americans' medical debt 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 SandersWarren overtakes Biden in Iowa for first time: poll The polls are asking the wrong question Sanders unveils plan to eliminate Americans' medical debt MORE (I-Vt.). 

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Sen. Kamala HarrisKamala Devi HarrisWarren overtakes Biden in Iowa for first time: poll Iowa GOP swipes at 2020 Democrats' meat positions as candidates attend annual Steak Fry Warren avoids attacks while building momentum 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 ButtigiegWarren overtakes Biden in Iowa for first time: poll The polls are asking the wrong question Booker aide sounds alarm about campaign's funding 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 GabbardAnalysis: 2020 digital spending vastly outpaces TV ads Sanders searches for answers amid Warren steamroller Kavanaugh book author on impeachment calls: 'That's not our determination to make' MORE (D-Hawaii) notably received 3 percent in the recent poll, as did former Rep. Beto O'RourkeBeto O'RourkeO'Rourke gun confiscation talk alarms Democrats NRA deems O'Rourke 'Salesman of the Month' after Arizona gun store sells out of AR-15s during 'Beto Special' MSNBC 'Climate in Crisis' special draws 1.3M viewers in 8 pm timeslot MORE (D-Texas). 

Sen. Cory BookerCory Anthony BookerIowa GOP swipes at 2020 Democrats' meat positions as candidates attend annual Steak Fry Booker aide sounds alarm about campaign's funding 2020 Democrats defend climate priorities in MSNBC forum 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.