Biden's lead shrinks in South Carolina poll

Former Vice President Joe BidenJoe BidenSanders defends Castro comments in wake of backlash from some Democrats Klobuchar releases medical report that says she's in 'very good health' Candidates face pressure to exit presidential race MORE has an 11-point lead over the next closest contender in South Carolina, but recent gains by Sen. Elizabeth WarrenElizabeth Ann WarrenCandidates face pressure to exit presidential race Buttigieg proposes undoing SALT deduction cap Bloomberg called Warren 'scary,' knocked Obama's first term in leaked audio MORE (D-Mass.) and South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegSanders says idea he can't work with Republicans is 'total nonsense' Sanders defends Castro comments in wake of backlash from some Democrats Candidates face pressure to exit presidential race 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 SandersBernie SandersSanders says idea he can't work with Republicans is 'total nonsense' Sanders defends Castro comments in wake of backlash from some Democrats Sanders releases list of how to pay for his proposals MORE (I-Vt.) at 13 percent, Sen. Kamala HarrisKamala Devi HarrisThis week: House to vote on legislation to make lynching a federal hate crime Juan Williams: Black votes matter Clyburn: Biden 'suffered' from not doing 'enough' in early debates 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.