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 an 11-point lead over the next closest contender in South Carolina, but recent gains by 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.) 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 (D) have cut into his advantage, according to a new poll.

The latest Post and Courier survey finds Biden on top of the crowded Democratic field in the Palmetto State at 30 percent support, followed by Warren at 19 percent, 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.) at 13 percent, 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.) at 11 percent and Buttigieg at 9 percent.

Biden is down 6 points over the same poll from August, while Warren has moved up 2 points and Buttigieg has gained 4 points since August.

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In May, Biden led the next closest contender by 31 points. That advantage dipped to 20 points in June, 19 points in August and now 11 in October.

Biden is running near the top in the three other early voting states as well, but South Carolina is viewed by many as his firewall, as he continues to lead the field among black voters, who make up about two-thirds of the Democratic primary electorate in the state.

But the Post and Courier survey found that Biden’s decline in South Carolina has largely been driven by African American women. Biden has lost 13 points month-over-month among that important voting bloc, and he has lost 10 points among women overall.

The Post and Courier-Change Research survey of 731 likely Democratic primary voters in South Carolina was conducted between Oct. 15 and Oct. 21 and has a 3.6 percentage point margin of error.