Former New York City Mayor Michael BloombergMichael Rubens BloombergBooker campaign rakes in million after Harris exits 2020 race Dozens of Virginia counties declare themselves 'Second Amendment sanctuaries' after Democrats win state legislature Bloomberg apologizes after critics say his calling Booker 'well spoken' was racist MORE (D) topped Sen. Kamala HarrisKamala Devi HarrisBooker campaign rakes in million after Harris exits 2020 race Democrats battle for Hollywood's cash Yang expands campaign with senior hires for digital operations 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 BidenPence: It's not a "foregone conclusion" that lawmakers impeach Trump Warren, Buttigieg fight echoes 2004 campaign, serves as warning for 2020 race Trump: Giuliani to deliver report on Ukraine trip to Congress, Barr MORE (D), Sens. Elizabeth WarrenElizabeth Ann WarrenTrump calls Warren 'Pocahontas,' knocks wealth tax Warren, Buttigieg fight echoes 2004 campaign, serves as warning for 2020 race Democrats battle for Hollywood's cash MORE (D-Mass.) and Bernie SandersBernie SandersWarren, Buttigieg fight echoes 2004 campaign, serves as warning for 2020 race Democrats battle for Hollywood's cash Sanders, Omar to hit campaign trail in New Hampshire MORE (I-Vt.), and South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegWarren, Buttigieg fight echoes 2004 campaign, serves as warning for 2020 race Chicago Mayor Lightfoot to Buttigieg: 'Break that NDA' to have 'moral authority' against Trump Sanders, Omar to hit campaign trail in New Hampshire 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 YangYang expands campaign with senior hires for digital operations Biden: All-white debate not representative of party, but 'you can't dictate' nominee Delaney to DNC: Open second debate stage for candidates who qualified for past events MORE, Amy KlobucharAmy Jean KlobucharBiden: All-white debate not representative of party, but 'you can't dictate' nominee Delaney to DNC: Open second debate stage for candidates who qualified for past events There's a lot to like about the Senate privacy bill, if it's not watered down 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 SteyerThomas (Tom) Fahr SteyerBooker campaign rakes in million after Harris exits 2020 race Biden: All-white debate not representative of party, but 'you can't dictate' nominee Delaney to DNC: Open second debate stage for candidates who qualified for past events MORE, the primary also lost two candidates over the last few days.

Former Rep. Joe Sestak (D-Pa.) and Montana Gov. Steve BullockSteve BullockThe Hill's Campaign Report: Democrats worry about diversity on next debate stage The Hill's Morning Report — Pelosi makes it official: Trump will be impeached Steve Bullock exits: Will conservative Democrats follow? 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