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 maintains the lead in the Democratic presidential primary, but 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.) is closing in on his first place spot, according to a new poll.

A CBS/YouGov delegate tracker included in a poll released Sunday, estimates Biden has 600 delegate votes from early contest states. The estimate found that Warren has 545 delegates from the same early voting states.

Sanders, with 286 estimated delegates, is in third, based on the poll. All other candidates were estimated to have fewer than 40 delegate votes.

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Warren is also neck and neck with Biden for support among primary voters in early states, based on the poll.

The poll found them statistically tied, with Warren at 26 percent and Biden at 25 percent.

Sanders polled at 19 percent.

Harris was a far behind fourth at 8 percent, trailed by South Bound, 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 6 percent. Sen. Cory Booker Cory Anthony BookerThe movement to reform animal agriculture has reached a tipping point Watchdog confirms State Dept. canceled award for journalist who criticized Trump 3 reasons why Biden is misreading the politics of court packing MORE (D-N.J.) polled at 4 percent.

All other candidates are at 2 percent or less in early states, based on the poll.

Ten candidates will be facing off in a debate this week in Texas with the remainder of the field still hoping to meet the necessary polling criteria to qualify for October's debates.

The poll surveyed 7,804 Democrats and Democrat-leaning independents between Aug. 28 and Sept. 4 There is a margin of error of 1.8 percentage points.