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Biden holds sizable lead in new Hill/HarrisX 2020 poll

Former Vice President Joe BidenJoe BidenHarris says she has 'not yet' spoken to Pence Kamala Harris, Stacey Abrams among nominees for Time magazine's 2020 Person of the Year Obama: Republican Party members believe 'white males are victims' MORE maintains a sizable lead over Sen. Bernie SandersBernie SandersClyburn: Biden falling short on naming Black figures to top posts Prepare for buyers' remorse when Biden/Harris nationalize health care Biden: 'Difficult decision' to staff administration with House, Senate members 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 GabbardSix people whose election wins made history Next Congress expected to have record diversity Native Americans elected to Congress in record numbers this year 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 John TrumpUSAID administrator tests positive for COVID-19 Kamala Harris, Stacey Abrams among nominees for Time magazine's 2020 Person of the Year DOJ appeals ruling preventing it from replacing Trump in E. Jean Carroll defamation lawsuit 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