South Bend, Ind. Mayor Pete ButtigiegPete ButtigiegBogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq A socially and environmentally just way to fight climate change MORE has slipped 4 percentage points in a new Hill-HarrisX poll of the Democratic presidential primary race that finds former Vice President Joe BidenJoe BidenCast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response Biden tells CNN town hall that he has benefited from white privilege MORE still leading the pack.

The nationwide survey published Wednesday found that Buttigieg dropped from 9 percent support to 5 percent among likely Democratic voters and Democratic-leaning independents. The South Bend mayor is now in a dead heat for fourth place with former New York Mayor Michael BloombergMichael BloombergTop Democratic super PAC launches Florida ad blitz after Bloomberg donation The Hill's 12:30 Report - Presented by Facebook - Latest with the COVID-19 relief bill negotiations The Memo: 2020 is all about winning Florida MORE, who also received 5 percent support.

Buttigieg had recently worked his way to the front of the 2020 Democratic primary, particularly in early primary and caucus states Iowa and New Hampshire. According to the RealClearPolitics averages, Buttigieg leads with 22.4 percent support in Iowa and holds second place in New Hampshire with 17.7 percent support, behind Sen. Bernie SandersBernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE’s (I-Vt.) 19 percent.

Biden, meanwhile, continues to top the Hill-HarrisX survey at 29 percent.

Sanders and Elizabeth WarrenElizabeth WarrenWarren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon No new taxes for the ultra rich — fix bad tax policy instead MORE (D-Mass.) followed, each receiving 13 percent support as they jockey to claim the mantle of the party's progressive wing.

Former Housing and Urban Development Secretary Julian CastroJulian CastroSanders says Democrats should have given more speaking time to progressives Castro says DNC should have put more Latino speakers on stage from beginning Jill Biden defends husband's cognitive ability from Trump attacks: 'It's ridiculous' MORE has 4 percent support, while Sen. Amy KlobucharAmy KlobucharEPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates Biden marks anniversary of the Violence Against Women Act, knocks Trump and McConnell MORE (D-Minn.), tech entrepreneur Andrew YangAndrew YangDoctor 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 Buttigieg launches his own podcast MORE and billionaire Tom SteyerTom 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 each garnered 3 percent. The rest of the Democratic field registered at 2 percent or less.

The survey comes ahead of Thursday’s 2020 primary debate in Los Angeles, where seven candidates are poised to take the stage.

The sixth Democratic debate has been threatened by two separate labor disputes.

The event was initially supposed to be held at the University of California-Los Angeles but was moved after a local labor group accused the university of “illegal practices” and announced that it was boycotting campus speakers.

The debate’s new location at Loyola Marymount University has also faced a boycott over a fight with a union representing university workers. All seven of the Democrats who qualified for the debate at first threatened to skip the event due to the conflict, but the union has since announced an agreement with food services company Sodexo, allowing for it to continue as planned. 

The Hill-HarrisX poll was conducted among 456 likely Democratic voters and Democratic-leaning independents between Dec. 13 and 14. It has a margin of error of 4.6 percent points.

—Tess Bonn