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Biden holds sizable lead in new Hill/HarrisX 2020 poll

Former Vice President Joe BidenJoe BidenCNN: Bidens' dogs removed from the White House Federal judge rules 'QAnon shaman' too dangerous to be released from jail Pelosi says Capitol riot was one of the most difficult moments of her career MORE maintains a sizable lead over Sen. Bernie SandersBernie SandersSanders urges support for Newsom amid recall effort This week: Congress set to send .9 trillion coronavirus bill to Biden Lawmakers, activists remember civil rights icons to mark 'Bloody Sunday' MORE (I-Vt.) in a new Hill/HarrisX poll of the Democratic presidential race.

More than half of Democrats and Democratic-leaning registered voters in the poll, 55 percent, said Biden should be the party's next nominee, compared to 31 percent for Sanders.

Sanders gained 3 points since a previous survey released last week, while Biden has held onto his double-digit lead in the poll.

The survey also found Rep. Tulsi GabbardTulsi GabbardTulsi Gabbard blasts new House rules on gender neutral language as 'height of hypocrisy' A vaccine, a Burrito and more: 7 lighter, memorable moments from 2020 Growing number of House Republicans warm to proxy voting MORE (D-Hawaii) with 4 percent support, a 2-point drop from last week. Another 7 percent of voters said they were unsure who they would support.

The survey was conducted in the days leading up to the latest series of primaries on Tuesday, where Biden extended his delegate lead by sweeping all three states that held voting.

"What these latest polling numbers tell me is that the nomination looks pretty clear for Joe Biden," Mallory Newall, Director of Research for Ipsos Public Affairs, told The Hill. "It tells me that the Democratic base is starting to coalesce around him," she added.

Biden clinched victories in Arizona, Florida and Illinois on Tuesday, putting him on the cusp of an insurmountable delegate lead over Sanders.

A fourth state, Ohio, was set to vote Tuesday but Gov. Mike DeWine (R) postponed the primary to avoid congested in-person polling situations amid the coronavirus crisis.

Sanders has used the pandemic as a way to advocate for his "Medicare for All" health care plan, which has polled well in primary exit polls this cycle.

Health care also remains one of the top issues for Democratic voters.

Still, Newall noted, Democrats are primarily concerned with defeating President TrumpDonald TrumpTrump vows 'No more money for RINOS,' instead encouraging donations to his PAC Federal judge rules 'QAnon shaman' too dangerous to be released from jail Pelosi says Capitol riot was one of the most difficult moments of her career MORE in November.

"What this primary comes down to is whoever can beat President Trump, full stop. That is what Democrats care about and that is what I think is starting to more and more shape their views and shape their voting in these primary elections," Newall added.

The Sanders campaign said Wednesday that the senator plans to assess his candidacy after Tuesday's losses.

The Hill-HarrisX poll was conducted online among 894 registered Democratic and Democratic-leaning independent voters. It has a margin of error of plus or minus 3.3 percentage points.

—Gabriela Schulte