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's support among black voters has slid, but he still holds a double-digit lead against his rivals for the Democratic presidential nomination, according to a new poll.

A Morning Consult survey released on Tuesday finds Biden in the lead with the support of 31 percent of Democratic primary voters nationwide, followed by 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.) at 19 percent, 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 (Calif.) at 14 percent 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 (Mass.) at 13 percent.

The 7-point drop for Biden in the past three weeks comes as Harris has improved by 8 points in that time. Support for Sanders and Warren is unchanged in Morning Consult polling.

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Biden’s loss of support is almost wholly attributable to softer support from black voters. The former vice president lost 8 points among that key constituency, while Harris picked up 7 points.

At the first Democratic debate in late June, Harris hammered Biden over remarks he made about having found common ground working with segregationists in the Senate decades ago. And she challenged Biden over his past opposition to a federal busing law aimed at integrating schools.

Still, Biden remains the top choice among black voters, with 38 percent support, followed by Sanders at 21 percent, Harris at 16 percent and Warren at 7 percent.

The Morning Consult online survey of 16,599 potential Democratic primary voters was conducted between July 1 and July 7 and has a 1 percentage point margin of error.