Biden lead shrinks, Sanders and Warren close gap: poll

Former Vice President Joe BidenJoe BidenCNN's Anderson Cooper mocks WH press secretary over Fox News interview Yang cautions Democrats: Impeachment might not be 'successful' Ocasio-Cortez: Sanders' heart attack was a 'gut check' moment MORE still leads the Democratic presidential primary field in a Fox News poll released Wednesday, but Sen. Bernie SandersBernie SandersOcasio-Cortez: Sanders' heart attack was a 'gut check' moment Ocasio-Cortez tweets endorsement of Sanders Ocasio-Cortez throws support to Sanders at Queens rally MORE (I-Vt.) and Sen. Elizabeth WarrenElizabeth Ann WarrenTrump says his Doral resort will no longer host G-7 after backlash Ocasio-Cortez: Sanders' heart attack was a 'gut check' moment Ocasio-Cortez tweets endorsement of Sanders MORE (D-Mass.) are closing the gap. 

Biden's 29 percent support from Democratic primary voters is down 6 percentage points from his highest poll numbers in May. The former vice president leads all other candidates by 11 points, compared to his 19-point lead in June.

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Sanders earned 18 percent support, the highest he has received in a Fox News poll. Warren dropped 4 percentage points from August to 16 percent support. 

Fifty-six percent of Democratic primary voters said they prioritize a candidate who has the best chance to beat President TrumpDonald John TrumpPelosi arrives in Jordan with bipartisan congressional delegation Trump says his Doral resort will no longer host G-7 after backlash CNN's Anderson Cooper mocks WH press secretary over Fox News interview MORE, up 15 percentage points from March. Voters have traditionally seen Biden as the most electable, although the other candidates are closing the gap.

The former vice president and two New England senators are solidifying their status as front-runners in the race. 

Behind them are Sen. Kamala HarrisKamala Devi HarrisKamala Harris reacts to supporter who got tattoo of her handwriting Even with likely Trump impeachment, Democrats face uphill climb to win presidency Harris campaign releases web video highlighting opposition to death penalty MORE (D-Calif.) at 7 percent, South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegSenate Democrats want Warren to talk costs on 'Medicare for All' Sanders seeks spark from Ocasio-Cortez at Queens rally Biden seeks to fundraise off fact he's running out of money MORE at 5 percent, former Rep. Beto O'RourkeBeto O'RourkeSuper PAC seeks to spend more than million supporting Yang Krystal Ball rips media for going 'all-in' on Buttigieg's debate performance The Hill's Campaign Report: Biden camp faces new challenges MORE (D-Texas) at 4 percent and Sen. Cory BookerCory Anthony BookerGabbard hits back at 'queen of warmongers' Clinton The Hill's Campaign Report: Biden camp faces new challenges Former public school teacher: Strikes 'wake-up call' for Democratic Party MORE (D-N.J.) at 3 percent.

Entrepreneur Andrew YangAndrew YangYang cautions Democrats: Impeachment might not be 'successful' Yang defends Gabbard: She 'deserves much more respect' Super PAC seeks to spend more than million supporting Yang MORE and Sen. Amy KlobucharAmy Jean KlobucharDeVos calls Democratic presidential hopeful's education plans 'crazy' Senate Democrats want Warren to talk costs on 'Medicare for All' Biden struggles to reverse fall MORE (D-Minn.) follow at 2 percent.

Biden keeps the lead when distinguishing between white and nonwhite voters. But he has a 13 percentage point lead among nonwhite voters, compared to a 7 percentage point lead among white voters, which aligns with previous polls.

The poll was conducted between Sept. 15 and Sept. 17 with 1,008 registered voters. The margin of error is 4.5 percentage points for Democratic primary voters.