Former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE has increased his lead among Democratic primary voters in South Carolina by 29 percentage points, according to a Fox News poll.

Biden received 41 percent support from South Carolina voters, a 6 percentage point increase from July, when he held a 21 percentage point lead above his opponents.

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Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) also saw a boost to 12 percent support, while Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) dropped to 10 percent support. Sanders has canceled campaign events until further notice after he suffered a heart attack.

Behind the frontrunners lie Sen. Kamala Harris Kamala HarrisTexas Democratic official urges Biden to visit state: 'I thought he had his own plane' The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements A game theorist's advice to President Trump on filling the Supreme Court seat MORE (D-Calif.) with 4 percent, a 12-percentage-point drop from July and billionaire philanthropist Tom Steyer Tom SteyerTV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' OVERNIGHT ENERGY: Trump administration finalizes plan to open up Alaska wildlife refuge to drilling | California finalizes fuel efficiency deal with five automakers, undercutting Trump | Democrats use vulnerable GOP senators to get rare win on environment MORE with 4 percent.

The poll qualified Steyer for the November debate, as the fourth poll where he earned higher than 3 percent.

Sen. Cory Booker Cory Anthony BookerThe movement to reform animal agriculture has reached a tipping point Watchdog confirms State Dept. canceled award for journalist who criticized Trump 3 reasons why Biden is misreading the politics of court packing MORE (D-N.J.) earned 3 percent and South Bend, Ind. Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE received 2 percent support.

The former vice president's support among black voters appears to be largely responsible for the wide margin. He maintains a 4 point advantage on Warren among white voters but leads her by 41 points among blacks. He also leads among men and those over 45.

When the poll combined voters' first and second choices, Biden soared to 52 percent, with Warren at 28 percent and Sanders at 23 percent.

The poll was conducted between Sept. 29 and Oct. 2, surveying 803 South Carolina Democratic primary voters. The margin of error was 3.5.

The poll distinguishing which races support the candidates had a margin of error of 6 for white voters and 4.5 for black voters.