Former New York City Mayor Michael BloombergMichael Rubens BloombergTrump slams Bloomberg over comments on man who shot Texas gunman Bloomberg: 'My story might have turned out very differently if I had been black' Sanders, Warren battle for progressive endorsements MORE (D) topped Sen. Kamala HarrisKamala Devi HarrisParnas pressure grows on Senate GOP Sanders defends vote against USMCA: 'Not a single damn mention' of climate change The Hill's Morning Report — President Trump on trial 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 BidenNYT editorial board endorses Warren, Klobuchar for Democratic nomination for president Trump rails against impeachment in speech to Texas farmers Biden breaks away from 2020 pack in South Carolina MORE (D), Sens. Elizabeth WarrenElizabeth Ann WarrenNYT editorial board endorses Warren, Klobuchar for Democratic nomination for president Trump rails against impeachment in speech to Texas farmers Biden breaks away from 2020 pack in South Carolina MORE (D-Mass.) and Bernie SandersBernie SandersNYT editorial board endorses Warren, Klobuchar for Democratic nomination for president Trump rails against impeachment in speech to Texas farmers Biden breaks away from 2020 pack in South Carolina MORE (I-Vt.), and South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegBiden breaks away from 2020 pack in South Carolina Sanders says gender 'still an obstacle' for female politicians Sanders v. Warren is just for insiders 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's wife, Evelyn Yang, calls for 'big structural change' at 4th annual Women's March DNC announces new criteria for New Hampshire debate Poll: Sanders holds 5-point lead over Buttigieg in New Hampshire MORE, Amy KlobucharAmy Jean KlobucharNYT editorial board endorses Warren, Klobuchar for Democratic nomination for president Sanders v. Warren is just for insiders Buttigieg to attend MLK Day event in South Carolina after facing criticism 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 Fahr SteyerBiden breaks away from 2020 pack in South Carolina Buttigieg to attend MLK Day event in South Carolina after facing criticism Poll: Sanders holds 5-point lead over Buttigieg in New Hampshire MORE, the primary also lost two candidates over the last few days.

Former Rep. Joe Sestak (D-Pa.) and Montana Gov. Steve BullockSteve BullockBrent Budowsky: Bloomberg should give billion to Democrats Key moments in the 2020 Democratic presidential race so far Kamala Harris dropped out, but let's keep her mental health plan alive 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