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.) has closed in on 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’s lead in the Democratic presidential primary as the two top-tier candidates pull ahead of the rest of the field, according to a new poll.

Biden and Warren are both the first-choice candidate of 25 percent of Democratic voters, based on an Economist-YouGov poll released Wednesday.

Biden had been at 25 percent in last week’s poll, but it’s a 6-point jump for Warren, who was at 19 percent last week.

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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.) trails the leading Democrats by 9 points, at 16 percent. It’s a 1-point drop for Sanders, based on the weekly poll tracker.

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) and 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.) round out the top of the field at 7 percent and 6 percent, respectively.

No other candidate polled above 2 percent.

Warren’s support is also more evenly distributed between Americans of different ages, while Biden’s support is largest among older voters and Sanders is most popular with younger Democrats, based on the poll.

The poll found Warren has 24 percent support among voters 18 to 29 and 31 percent from voters 65 and older. Biden has just 9 percent of support from voters 18 to 29, and Sanders has just 5 percent of voters 65 and older.

Biden maintains the largest support from black voters, though, at 34 percent, based on the poll.

The poll was conducted from Sept. 22 to 24. It surveyed 1,500 people and 1,198 registered voters. There is a margin of error of 2.8 percentage points and 2.9 percentage points for registered voters.