Former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE maintains a comfortable lead over the other candidates in the Democratic Party's 2020 primary field, according to a new poll.

A Fox News poll released Thursday found that Biden enjoys an 18-point lead over his closest challenger, Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.), with Sen. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.) sitting in third place.

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Biden was supported by 35 percent of likely Democratic primary voters in the poll, up from 31 percent in March, while Sanders sat at 17 percent, a slight dip from March, when he registered support from 23 percent of voters.

Warren, meanwhile, has yet to break double digits even as she has seen her support in the poll surge from 4 percent in March to 9 percent in the most recent poll.

Also having notable shifts in support in the poll were Sen. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.), who saw her support dip from 8 percent to 5 percent, and South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegThe Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice Hillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield MORE (D), who has climbed to fourth place at 6 percent after previously registering just 1 percent support in March.

Defeating President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE remains the top priority of Democratic primary voters, according to the poll, which found that 73 percent listed a victory in November 2020 as their top priority over policy decisions.

Fifty-one percent want to see someone who shares their views take office by comparison, and 47 percent want someone with "new ideas" to take office.

The Fox News poll was conducted between May 11-14 and contacted 469 registered Democratic voters nationwide. The margin of error is 4.5 percentage points.