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 increased his lead atop a crowded field of Democratic presidential candidates by 2 points, a new poll finds.

Biden now has the support of 33 percent of Democratic primary voters across the nation, according to the Morning Consult survey, 13 points above the next-most popular candidate, Sen. 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.)

Rounding out the top five are Sen. 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 15 percent, followed by 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.) at 8 percent and 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 at 5 percent, the poll shows.

Among early voters in Iowa, New Hampshire, South Carolina or Nevada, Biden maintains a 16-point lead over Sanders, who is followed by Warren, Harris and billionaire Tom Steyer Tom SteyerTV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' OVERNIGHT ENERGY: Trump administration finalizes plan to open up Alaska wildlife refuge to drilling | California finalizes fuel efficiency deal with five automakers, undercutting Trump | Democrats use vulnerable GOP senators to get rare win on environment MORE, according to Morning Consult.

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The results come as Biden’s electability argument is showing signs of weakness, with a survey from Monmouth University on Monday showing the former vice president’s support slipping to below 20 percent. The results mark a double-digit decline from its last poll in June and put him in a three-way tie nationally with Sanders and Warren.

Democrats have cited the poll as evidence Biden isn’t suitable to earn the party’s presidential nomination and isn’t the candidate best equipped to defeat President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE in 2020 — a central focus of the party in choosing a nominee.

The Morning Consult poll surveyed more than 17,300 voters between Aug. 19 and Aug. 25. Its margin of error is 1 percent.