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 slipped into fourth place in a new survey from Quinnipiac University Poll released Tuesday, a sharp drop for the South Bend, Ind., mayor who less than a month ago surged into the second-place spot behind former Vice President Joe Biden Joe BidenBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Joe Biden should enact critical government reforms if he wins MORE.

Biden leads the pack in the latest poll with 29 percent support — up from 24 percent in November. Sens. Bernie Sanders Bernie SandersTrump, Biden will not shake hands at first debate due to COVID-19 Sanders tells Maher 'there will be a number of plans' to remove Trump if he loses Sirota reacts to report of harassment, doxing by Harris supporters MORE (I-Vt.) and 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.), meanwhile, are neck-and-neck, scoring 17 percent and 15 percent, respectively.

Buttigieg’s decline — from garnering the support of 16 percent of respondents last month to just 9 percent this month — puts him in fourth place, closer to the middle-tier of the Democratic presidential field than the three top-tier contenders. In fifth place is former New York City Mayor Michael Bloomberg Michael BloombergBloomberg rolls out M ad buy to boost Biden in Florida Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Bloomberg pays fines for 32,000 felons in Florida so they can vote MORE at 5 percent and in sixth is former tech executive Andrew Yang Andrew YangBiden's latest small business outreach is just ... awful Doctor who allegedly assaulted Evelyn Yang arrested on federal charges The Hill's Campaign Report: Biden weighs in on police shootings | Who's moderating the debates | Trump trails in post-convention polls MORE at 4 percent, the poll shows.

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The poll is welcome news for the primary field’s top tier, giving Biden his first double-digit lead in a Quinnipiac survey since August and showing Sanders with his highest level of support since a Quinnipiac poll in June.

Warren’s support is similar to the 14 percent she scored in last month’s survey, suggesting that her polling numbers may be stabilizing after a stark 14-point drop between October and November, Quinnipiac polling data shows.

The poll also brings good news for Yang, giving him the fourth and final survey he needed to qualify for the next Democratic presidential debate on Dec. 19. That makes him the seventh active candidate to make the debate. Sen. Kamala Harris Kamala HarrisPelosi: Trump Supreme Court pick 'threatens' Affordable Care Act What Kamala Harris' VP nomination means to us Harris slams Trump's Supreme Court pick as an attempt to 'destroy the Affordable Care Act' MORE (D-Calif.) had qualified for the debate, but forfeited her place on stage when she suspended her campaign last week.

In hypothetical head-to-head match-ups, six Democratic presidential contenders appear on track to defeat President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE in 2020.

Biden performs the best in that metric, with 51 percent of registered voters saying they would vote for him compared to 42 percent who said they planned on casting their ballots for Trump. Sanders isn’t far behind. Fifty-one percent said they would choose him compared to 43 percent who said they would vote for the incumbent.

Warren, Bloomberg, Buttigieg and Sen. Amy Klobuchar Amy Klobuchar3 reasons why Biden is misreading the politics of court packing Social media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight MORE (D-Minn.) all bested Trump in hypothetical match-ups as well, according to the Quinnipiac poll.

The Quinnipiac University poll surveyed 1,553 registered voters, including 665 Democrats and Democratic-leaning independent voters, from Dec. 4-9. It has a margin of error of plus or minus 2.5 percentage points for the full sample and plus or minus 3.8 points for the Democratic and Democratic-leaning respondents.