Former New York City Mayor Michael BloombergMichael Rubens BloombergSteyer would have owed M more in taxes under lawmakers' proposal: liberal group Majority sees no ties between business experience and political success Fifth congressional Democrat backs Bloomberg in 2020 race MORE (D) topped Sen. Kamala HarrisKamala Devi HarrisBiden leads 2020 pack in congressional endorsements Harris on 2020 endorsement: 'I am not thinking about it right now' Panel: Is Kamala Harris a hypocrite for mulling a Joe Biden endorsement? 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 BidenWarren: Dershowitz presentation 'nonsensical,' 'could not follow it' Bolton told Barr he was concerned Trump did favors for autocrats: report Dershowitz: Bolton allegations would not constitute impeachable offense MORE (D), Sens. Elizabeth WarrenElizabeth Ann WarrenWarren: Dershowitz presentation 'nonsensical,' 'could not follow it' On The Money: Stocks close with steep losses driven by coronavirus fears | Tax season could bring more refund confusion | Trump's new wins for farmers may not undo trade damage Overnight Energy: Sanders scores highest on green group's voter guide | Trump's latest wins for farmers may not undo trade damage | Amazon employees defy company to speak on climate change MORE (D-Mass.) and Bernie SandersBernie SandersGOP Iowa senator suggests Trump impeachment defense could hurt Biden at caucuses On The Money: Stocks close with steep losses driven by coronavirus fears | Tax season could bring more refund confusion | Trump's new wins for farmers may not undo trade damage Sanders launches first TV ads in Nevada MORE (I-Vt.), and South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegOvernight Energy: Sanders scores highest on green group's voter guide | Trump's latest wins for farmers may not undo trade damage | Amazon employees defy company to speak on climate change Sanders surges to first in New Hampshire: poll Majority sees no ties between business experience and political success 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 YangOvernight Energy: Sanders scores highest on green group's voter guide | Trump's latest wins for farmers may not undo trade damage | Amazon employees defy company to speak on climate change Majority sees no ties between business experience and political success Sanders scores highest on green group's voter guide MORE, Amy KlobucharAmy Jean KlobucharOvernight Energy: Sanders scores highest on green group's voter guide | Trump's latest wins for farmers may not undo trade damage | Amazon employees defy company to speak on climate change Sanders surges to first in New Hampshire: poll Majority sees no ties between business experience and political success 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 SteyerSouth Carolina woman behind popular Obama slogan says she backs Steyer Overnight Energy: Sanders scores highest on green group's voter guide | Trump's latest wins for farmers may not undo trade damage | Amazon employees defy company to speak on climate change Steyer would have owed M more in taxes under lawmakers' proposal: liberal group 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