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 holds his advantage over the Democratic primary field but his lead has slipped, according to a poll released Wednesday.

The CNN poll conducted by SSRS found Biden had the support of 24 percent of Democrats and Democrat-leaning independents, a 5 point drop from the same survey in August.

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Sens. 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.), at 18 percent, and 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 17 percent, were the only two other White House hopefuls to poll in double digits.

Warren's support grew 4 points since last month's poll, while Sanders's grew 2 points. While Sanders's support has remained relatively steady since May, Warren has moved up 11 points in CNN surveys since then.

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.) registered 8 percent support, 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) received 6 percent and former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas) polled at 5 percent.

No other candidates cleared 2 percent support.

The survey's results line up with the majority of primary polls which have found Biden, Warren and Sanders as the the front-runners for the nomination.

All three will feature on the same debate stage on Thursday.

SSRS surveyed 908 Democrats and Democrat leaning independents who are registered to vote between Sept. 5 and 9 by cellphone and landline. The margin of error for the sample is 4.3 points.