Former New York City Mayor Michael BloombergMichael BloombergFormer Bloomberg staffer seeks class-action lawsuit over layoffs Bloomberg spent over 0M on presidential campaign The Hill's Campaign Report: Officials in spotlight over coronavirus response MORE (D) topped Sen. Kamala HarrisKamala Devi HarrisMaryland Legislative Black Caucus pushes for state to release racial breakdown of coronavirus impact Biden associates reach out to Holder about VP search Biden confirms he's considering Whitmer for VP MORE (D-Calif.) in a new Hill-HarrisX poll of the Democratic presidential primary race.

The survey released on Monday found that support for the former mayor ticked up from 3 percent to 6 percent among likely Democratic voters and Democratic-leaning independents. 

Sen. Kamala Harris (D-Calif.), meanwhile, fell behind with 2 percent support, a two-point decrease.

This marks the first Hill-HarrisX poll that has been taken since Bloomberg officially jumped into the 2020 race, though he was included as a possible candidate in a previous survey.

However, Bloomberg still significantly trails the party’s current front-runners, former Vice President Joe BidenJoe BidenOvernight Health Care: Global coronavirus cases top 1M | Cities across country in danger of becoming new hotspots | Trump to recommend certain Americans wear masks | Record 6.6M file jobless claims The Memo: Scale of economic crisis sends shudders through nation The Hill's Campaign Report: Coronavirus forces Democrats to postpone convention MORE (D), Sens. Elizabeth WarrenElizabeth WarrenMaryland Legislative Black Caucus pushes for state to release racial breakdown of coronavirus impact Hillicon Valley: T-Mobile, Sprint complete merger | Warren pushes food delivery apps to classify workers as full employees | Lawsuit accuses Zoom of improperly sharing user data Warren calls on food delivery apps to classify workers as full employees MORE (D-Mass.) and Bernie SandersBernie SandersHuffPost political reporter on why Bernie fell way behind Biden Schumer: Administration 'must move heaven and earth' to implement new unemployment benefits Biden associates reach out to Holder about VP search MORE (I-Vt.), and South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegHuffPost political reporter on why Bernie fell way behind Biden Economists fear slow pace of testing will prolong recession The Hill's 12:30 Report: Pence defends response, says Trump never 'belittled' virus threat MORE (D). All four contenders have vied for control of the top tier of the Democratic field for months.

Biden still holds the lead, inching up one percentage point to 31 percent support. His fellow top rivals saw a slight dip, with Sanders dropping 3 points to 15 percent support and Warren sliding 5 percentage points to 10 percent.

Buttigieg, who gained momentum in recent weeks, received 9 percent support, a two-point increase from the prior Nov. 16-Nov. 17 poll.

Businessman Andrew YangAndrew YangAndrew Yang: Calling coronavirus 'China virus' only used to incite 'hostility' Andrew Yang to launch issues-based podcast Majority of young Americans support universal basic income, public healthcare: poll MORE, Amy KlobucharAmy KlobucharHillicon Valley: Zoom draws new scrutiny amid virus fallout | Dems step up push for mail-in voting | Google to lift ban on political ads referencing coronavirus Democrats press Trump, GOP for funding for mail-in ballots HuffPost political reporter on why Bernie fell way behind Biden MORE (D-Minn.) and former Housing and Urban Development Secretary Julián Castro garnered 2 percent.

The rest of the contenders in the crowded Democratic field received 1 percent in support or less. Another 3 percent said they were unsure. 

The survey comes in light of an ever-fluid Democratic primary race.

Though the field recently expanded with the addition of Bloomberg and billionaire Tom SteyerTom SteyerProgressive advocates propose T 'green stimulus' plan Candidates want data privacy rules, except for their own campaigns Budowsky: Biden should pull together a 'dream team of rivals' MORE, the primary also lost two candidates over the last few days.

Former Rep. Joe Sestak (D-Pa.) and Montana Gov. Steve BullockSteve BullockPolitics and the pandemic — Republicans are rightly worried The Hill's Campaign Report: Biden moves to unify party before general election Poll shows Daines, Bullock neck and neck in Montana Senate race MORE (D) each ended their 2020 White House bids after failing to gain traction in national polls.

Sestak announced the news in a press release over the weekend, saying he was thankful for what he called an "endeavor filled with immeasurable wisdom, passions, humor and insights to, and from, the people of America."

A day later, Bullock issued a statement announcing his own departure from the 2020 race.

"While the concerns that propelled me to enter in the first place have not changed, I leave this race filled with gratitude and optimism, inspired and energized by the good people I've had the privilege of meeting over the course of the campaign,” he wrote.

The Hill-HarrisX poll surveyed 1,001 registered voters between Nov. 1-Dec. 1. It has a margin of error of plus or minus 3.1 percentage points. 

—Tess Bonn