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Former New York City Mayor Michael BloombergMichael BloombergHolder, Yates lead letter backing Biden pick for Civil Rights Division at DOJ The truth behind companies' 'net zero' climate commitments The strategy Biden needs to pass his infrastructure plan MORE (D) topped Sen. Kamala HarrisKamala HarrisBiden, Harris commend Mondale in paving the way for female VP Overnight Energy: Treasury creates hub to fight climate change through finance | Sanders, Ocasio-Cortez introduce 'Green New Deal for Public Housing' | Harris: Americans able to 'breathe easier and sleep better' under Biden 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 BidenObama, Clinton reflect on Mondale's legacy Biden, Harris commend Mondale in paving the way for female VP Mondale in last message to staff: 'Joe in the White House certainly helps' MORE (D), Sens. Elizabeth WarrenElizabeth WarrenWorld passes 3 million coronavirus deaths Poll: 56 percent say wealth tax is part of solution to inequality Democratic senators call on Biden to support waiving vaccine patents MORE (D-Mass.) and Bernie SandersBernie SandersOvernight Energy: Treasury creates hub to fight climate change through finance | Sanders, Ocasio-Cortez introduce 'Green New Deal for Public Housing' | Don't attack Zoom for its Bernie Sanders federal tax bill Sanders, Ocasio-Cortez introduce 'Green New Deal for Public Housing' MORE (I-Vt.), and South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegBiden looks to bolster long-term research and development White House says gas tax won't be part of infrastructure bill The Hill's 12:30 Report: Biden meets with bipartisan lawmakers for infrastructure negotiations 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 lead in NYC mayor race: poll Evelyn Yang pens children's book on sexual abuse, reveals she was sexually assaulted as a child Yang pitches plan to revive Broadway, live performances in New York MORE, Amy KlobucharAmy KlobucharJimmy Carter remembers Mondale as 'best vice president in our country's history' Hillicon Valley: Apple approves Parler's return to App Store | White House scales back response to SolarWinds, Microsoft incidents | Pressure mounts on DHS over relationship with Clearview AI Democrats push Twitter, Facebook to remove vaccine 'disinformation dozen' 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 SteyerCalifornia Democrats weigh their recall options Why we should be leery of companies entering political fray Steyer says he has 'no plans' to run for public office again MORE, the primary also lost two candidates over the last few days.

Former Rep. Joe Sestak (D-Pa.) and Montana Gov. Steve BullockSteve BullockBiden set to pick conservation advocate for top land management role Montana governor signs bill banning sanctuary cities Progressives' majority delusions politically costly 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