Biden lead shrinks, Sanders and Warren close gap: poll

Former Vice President Joe BidenJoe BidenGiuliani says he is unaware of reported federal investigation Trump says Giuliani is still his lawyer Sondland to tell Congress 'no quid pro quo' from Trump: report MORE still leads the Democratic presidential primary field in a Fox News poll released Wednesday, but Sen. Bernie SandersBernie SandersSanders on difference with Warren: she's a capitalist 'I'm not' Sunday Show Preview: Trump's allies and administration defend decision on Syria Klobuchar takes shots at health and education plans supported by Sanders and Warren MORE (I-Vt.) and Sen. Elizabeth WarrenElizabeth Ann WarrenSanders on difference with Warren: she's a capitalist 'I'm not' Rubio hits Warren's 'crude' and 'vulgar' response to opposition to same-sex marriage Klobuchar takes shots at health and education plans supported by Sanders and Warren 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 TrumpGiuliani says he is unaware of reported federal investigation Louisiana's Democratic governor forced into runoff Lawmakers focus their ire on NBA, not China 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 HarrisKlobuchar takes shots at health and education plans supported by Sanders and Warren Kamala Harris to Trump Jr.: 'You wouldn't know a joke if one raised you' O'Rourke campaign says path to victory hinges on top 5 finishes in Iowa, Nevada MORE (D-Calif.) at 7 percent, South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegSunday Show Preview: Trump's allies and administration defend decision on Syria O'Rourke campaign says path to victory hinges on top 5 finishes in Iowa, Nevada O'Rourke raises .5 million in third quarter MORE at 5 percent, former Rep. Beto O'RourkeBeto O'RourkeO'Rourke raises .5 million in third quarter Conservatives slam Beto O'Rourke over threat to tax-exempt status for religious organizations The Hill's Campaign Report: Impeachment fight to take center stage at Dem debate MORE (D-Texas) at 4 percent and Sen. Cory BookerCory Anthony BookerO'Rourke campaign says path to victory hinges on top 5 finishes in Iowa, Nevada O'Rourke raises .5 million in third quarter The Hill's Campaign Report: Impeachment fight to take center stage at Dem debate MORE (D-N.J.) at 3 percent.

Entrepreneur Andrew YangAndrew YangO'Rourke campaign says path to victory hinges on top 5 finishes in Iowa, Nevada Hillicon Valley: Google, Reddit to testify on tech industry protections | Trump joins Amazon-owned Twitch | House to vote on bill to combat foreign interference O'Rourke raises .5 million in third quarter MORE and Sen. Amy KlobucharAmy Jean KlobucharKlobuchar takes shots at health and education plans supported by Sanders and Warren O'Rourke campaign says path to victory hinges on top 5 finishes in Iowa, Nevada O'Rourke raises .5 million in third quarter 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.