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Former New York City Mayor Michael BloombergMichael BloombergA closing argument: Why voters cannot trust Trump on healthcare Biden campaign swamps Trump on TV airwaves 2020 election already most expensive ever MORE (D) topped Sen. Kamala HarrisKamala HarrisUndecided voters in Arizona wary of Trump, crave stability Foreign policy is on the ballot in 2020; so is American credibility Perez on Biden's poll leads: Democrats 'take nothing for granted' 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 BidenBiden: Trump 'continues to lie to us' about coronavirus Rally crowd chants 'lock him up' as Trump calls Biden family 'a criminal enterprise' Undecided voters in Arizona wary of Trump, crave stability MORE (D), Sens. Elizabeth WarrenElizabeth WarrenPush to expand Supreme Court faces Democratic buzzsaw Georgia senator mocks Harris's name before Trump rally: 'Kamala-mala-mala, I don't know' Warren, Porter to headline progressive fundraiser supporting seven swing state candidates MORE (D-Mass.) and Bernie SandersBernie SandersPush to expand Supreme Court faces Democratic buzzsaw Senate Democrats seek to alleviate public concern about some results not being available on election night Georgia senator mocks Harris's name before Trump rally: 'Kamala-mala-mala, I don't know' MORE (I-Vt.), and South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegButtigieg says it's time to 'turn the page' on Trump administration Sunday shows preview: Coronavirus cases surge in the Midwest; Trump hits campaign trail after COVID-19 Biden town hall questioner worked as speechwriter in Obama administration: report 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 YangPelosi spars with CNN's Blitzer over COVID-19 aid: 'You really don't know what you're talking about' The shape of guaranteed income Biden's latest small business outreach is just ... awful MORE, Amy KlobucharAmy KlobucharSenate Democrats seek to alleviate public concern about some results not being available on election night Washington flooded with Women's March protesters ahead of Barrett confirmation vote Supreme Court battle turns into 2020 proxy war 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 Steyer2020 election already most expensive ever TV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' 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 Morning Report - Sponsored by Facebook - Trump combative, Biden earnest during distanced TV duel Steve Bullock raises .8 million in third quarter for Montana Senate bid Postal service reversing changes that slowed mail delivery 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