The battle for black support in the Democratic primary has broken wide open — and that’s bad news for former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE.

Biden had shot out to a lead in early polling, in large part because of his strong standing in the black community.

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But that backing has weakened in the wake of a first debate in Miami that saw Biden come under pressure from Sen. Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (D-Calif.) over his opposition to federally mandated busing and his affection for two now-deceased segregationist senators.

Biden’s answers on those questions were widely considered subpar.

He has still has not cleaned up the mess, almost one week on from the debate.

Biden’s difficulty “gets deeper by the day, as long as he doesn’t clarify it,” the Rev. Al Sharpton, the civil rights activist and broadcaster, told The Hill. “It’s not a deal-breaker but it is certainly a deal-shaker.”

Sharpton expressed particular dismay with Biden’s defense of his position on busing, which centered around the idea that it should be decided locally, not by the national government.

“Wait a minute, are we talking about ‘states’ rights?’ ” Sharpton asked.

New polls this week suggested Sharpton’s concerns were widely shared.

A Reuters/Ipsos poll released on Wednesday showed Biden's support among black Democrats having been cut roughly in half in a month, cratering from around 40 percent to about 20 percent.

A Quinnipiac University poll showed Biden retaining the support of 31 percent of black Democratic respondents, down from 48 percent the previous month — and Harris right behind him with 27 percent.

The results are ominous for Biden given his previous polling leads, his high name recognition, Harris’s comparatively recent arrival on the national stage and Biden’s service to former President Obama.

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Supporters of rival candidates are emphasizing what they see as his weakness.

“The Obama halo will only shine for so long,” academic Cornel West told The Hill. West, a supporter of Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.), added, “Sooner or later, Biden will have to stand on his own two feet.”

Bakari Sellers, a former South Carolina state representative who is supporting Harris, said that the high-profile exchange at the debate was “not really about busing. It was about Biden having issues dealing with race, and not atoning for those and reconciling those.”

Sellers asserted that “Joe Biden’s support in the black community has been wide but it is not deep.”

Biden and his supporters vigorously contest that idea.

They insist that his record on race is an honorable one, and that this recommended him to Obama as vice president in the first place. And they argue that social media platforms tend to amplify the voices of younger, more radical activists and thus underplay the older, more ideologically moderate voters who form the core of Biden’s support.

It’s also true that not every poll shows a precipitous drop in Biden’s support among non-white voters.

A CNN/SSRS survey for example, showed the race tightening sharply over the past month — but it still had Biden in first place. His support among non-white voters had declined by a modest 5 points, from 30 percent to 25 percent.

There is no doubt that black voters will be pivotal in determining the outcome of the nomination. Not only do African American voters form an essential part of the Democratic coalition nationwide, they typically account for an outright majority of the voters in South Carolina, one of the key early primaries.

“You cannot win the Democratic nomination without overwhelming support from the black community. It’s just not possible,” said Karine Jean-Pierre, the chief public affairs officer for progressive group MoveOn. “And for the Democratic nominee, they cannot win the presidency without overwhelming support from black voters.”

But Jean-Pierre also noted that, when it comes to black support, “I don’t think anything is locked in, for anyone.”

Harris is one of two black senators in the field this year, along with Sen. Cory Booker Cory Anthony Booker3 reasons why Biden is misreading the politics of court packing Bipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility MORE (D-N.J.). In addition, Sanders and Sen. Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Mass.) are both making their own determined efforts to court African American support.

The multicandidate field reduces the chances of a straightforward shift in support as was seen during the 2008 cycle.

On that occasion, Obama struggled initially against then-Sen. Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE (D-N.Y.), as she won considerable support from black voters as well as black elected officials. But that began to change quickly, especially after Obama’s victory in the Iowa caucuses.

This time around, it seems much more likely that black support will continue to be divided among several candidates.

“We’re in a different moment,” said Adrianne Shropshire, the executive director of BlackPAC, which works to harness black political power. “This is the most diverse field of Democratic candidates for president that we have ever seen … I’m not sure we are going to see [black] voters move en masse from one candidate to the next.”

There is, too, a risk of oversimplifying or exaggerating the effect of a single moment. Not everyone was persuaded that Harris’s debate challenge to Biden — forceful though it was — will ultimately benefit her as much as her fans think.

Several sources who spoke to The Hill noted that her decision to put the spotlight on Biden’s past invited an examination of her own record as a prosecutor.

Harris previously served as California’s attorney general and, before that, as San Francisco district attorney — posts in which progressives have been critical of parts of her record, including what they perceive to be harsh policies against parents whose children were prone to truancy.

“Suppose Biden turns around and says, ‘Let’s talk about your past’ — things, when she was attorney general, that she did or didn’t do,” said Earl Ofari Hutchinson, a California-based author and radio host. “You are going down a slippery slope, raking another candidate over the coals” in the way Harris did.

Still, one thing seems certain: any sense that Biden’s connection with Obama would offer him long-standing protection among black voters is eroding by the day.

“The mistake Biden and Biden's campaign is making is thinking ‘My association with Barack Obama Barack Hussein ObamaObama warns of a 'decade of unfair, partisan gerrymandering' in call to look at down-ballot races Quinnipiac polls show Trump leading Biden in Texas, deadlocked race in Ohio Poll: Trump opens up 6-point lead over Biden in Iowa MORE is enough,’ and it isn’t,” said Aimee Allison, founder of She The People, an organization that seeks to promote non-white female candidates. “He has strong name ID but he is losing steam.”

Rashad Robinson, the president of Color Of Change, a civil rights organization, agreed.

“Black people didn’t wait on long lines and surpass white voters in terms of turnout in 2012 for the first time because they were showing up for Joe Biden,” Robinson said.

“They were showing up for Barack Obama — and Michelle Obama Michelle LeVaughn Robinson ObamaBlack stars reimagine 'Friends' to get out the vote Obama shares phone number to find out how Americans are planning to vote Michelle Obama: 'Don't listen to people who will say that somehow voting is rigged' MORE.”