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Biden's lead shrinks in South Carolina poll

Former Vice President Joe BidenJoe BidenDefense lawyers for alleged Capitol rioters to get tours of U.S. Capitol Sasse to introduce legislation giving new hires signing bonuses after negative jobs report Three questions about Biden's conservation goals MORE has an 11-point lead over the next closest contender in South Carolina, but recent gains by Sen. Elizabeth WarrenElizabeth WarrenFree Speech Inc.: The Democratic Party finds a new but shaky faith in corporate free speech Debate over ICBMs: Will 'defund our defenses' be next? Manchin on collision course with Warren, Sanders MORE (D-Mass.) and South Bend, Ind., Mayor Pete ButtigiegPete Buttigieg'Funky Academic:' Public has been 'groomed to measure progress by firsts' Biden administration in talks with LA Mayor Eric Garcetti for India ambassador post: reports Business groups target moderate Democrats on Biden tax plans 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 SandersGOP is consumed by Trump conspiracy theories Manchin on collision course with Warren, Sanders Sanders on Cheney drama: GOP is an 'anti-democratic cult' MORE (I-Vt.) at 13 percent, Sen. Kamala HarrisKamala HarrisBiden to record video message for 'Vax Live' concert Harris says Mexico, US can work together to improve quality of life in Northern Triangle Atlanta Mayor Keisha Lance Bottoms says 'it is time to pass the baton on to someone else' 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.