Former New York City Mayor Michael BloombergMichael Rubens BloombergBloomberg's doctor releases 'outstanding' health report for 2020 candidate Krystal Ball: Influx of billionaire cash in 2020 contest is 'deeply corrosive' to 'civil society' Houston Chronicle stops using Bloomberg News wire stories for campaign coverage MORE (D) topped Sen. Kamala HarrisKamala Devi HarrisOvernight Health Care — Presented by That's Medicaid — House passes sweeping Pelosi bill to lower drug prices | Senate confirms Trump FDA pick | Trump officials approve Medicaid work requirements in South Carolina Sanders endorses Young Turks founder Cenk Uygur for Katie Hill's former House seat Kamala Harris dropped out, but let's keep her mental health plan alive 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 BidenSenate gears up for battle over witnesses in impeachment trial Conservative group hits White House with billboard ads: 'What is Trump hiding?' Democrat representing Pennsylvania district Trump carried plans to vote to impeach  MORE (D), Sens. Elizabeth WarrenElizabeth Ann WarrenSaagar Enjeti says Buttigieg's release of McKinsey client list shows he 'caved to public pressure' On The Money: Lawmakers strike spending deal | US, China reach limited trade deal ahead of tariff deadline | Lighthizer fails to quell GOP angst over new NAFTA Bill Weld: As many as six GOP senators privately support convicting Trump MORE (D-Mass.) and Bernie SandersBernie SandersSaagar Enjeti says Buttigieg's release of McKinsey client list shows he 'caved to public pressure' Sanders endorses Young Turks founder Cenk Uygur for Katie Hill's former House seat Biden hires Clinton, O'Rourke alum as campaign's digital director MORE (I-Vt.), and South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegSaagar Enjeti says Buttigieg's release of McKinsey client list shows he 'caved to public pressure' Biden hires Clinton, O'Rourke alum as campaign's digital director Trump neck and neck with top 2020 Democrats in Wisconsin: poll 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 YangBooker says he will not make December debate stage Yang: 2020 rivals in Senate should be able to campaign amid impeachment Democrats set early state primary debates for 2020 MORE, Amy KlobucharAmy Jean KlobucharSenate gears up for battle over witnesses in impeachment trial Booker says he will not make December debate stage Yang: 2020 rivals in Senate should be able to campaign amid impeachment 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 SteyerKrystal Ball: Influx of billionaire cash in 2020 contest is 'deeply corrosive' to 'civil society' Booker says he will not make December debate stage Democrats set early state primary debates for 2020 MORE, the primary also lost two candidates over the last few days.

Former Rep. Joe Sestak (D-Pa.) and Montana Gov. Steve BullockSteve BullockKamala Harris dropped out, but let's keep her mental health plan alive The 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 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