Biden retains large lead over Sanders, other 2020 Dems in new Hill-HarrisX poll

Former Vice President Joe BidenJoe BidenScaramucci attends charity event featuring Biden in the Hamptons Klobuchar knocks Trump: 'This negotiating by tweet hasn't been working' Rendell: Biden 'baked in' as Democratic nominee MORE continues to lead an ever-growing pack of Democratic White House hopefuls, according to a Hill-HarrisX poll released Wednesday.

The May 17-18 survey found Biden was the preferred pick to become president of 33 percent of registered voters who identified as Democrats or as independents who leaned toward the party.

Sen. Bernie SandersBernie SandersTrump preps conspiracy theory to explain faltering economy Sanders doubles down on 'Medicare For All' defense: 'We have not changed one word' Sanders, Warren back major shift to fight drug overdoses MORE (I-Vt.) was the choice of 14 percent of respondents. Massachusetts Democratic Sen. Elizabeth WarrenElizabeth Ann WarrenTrump preps conspiracy theory to explain faltering economy Sanders, Warren back major shift to fight drug overdoses Rendell: Biden 'baked in' as Democratic nominee MORE was named by 8 percent followed by mayor Pete ButtigiegPeter (Pete) Paul ButtigiegSunday shows preview: Trump ratchets up trade war with China Democratic candidates face hard choices as 2020 field winnows Steyer calls on DNC to expand polling criteria for debates MORE and Sen. Kamala HarrisKamala Devi HarrisSanders doubles down on 'Medicare For All' defense: 'We have not changed one word' Obama reveals his summer playlist Democratic candidates face hard choices as 2020 field winnows MORE (D-Calif.) both with 6 percent. Former Rep. Beto O'RourkeBeto O'RourkeBiden mistakes New Hampshire for Vermont during campaign stop Steyer calls on DNC to expand polling criteria for debates Gabbard hits DNC over poll criteria for debates MORE was backed by 5 percent of respondents.

None of the other candidates received more than 1 percent support. Several aspirants were not named by any participant: Gov. Steve BullockSteve BullockDemocratic candidates face hard choices as 2020 field winnows The Hill's 12:30 Report: Stocks sink as Trump fights with Fed, China The Hill's Morning Report: How will Trump be received at G-7? MORE (D-Mont.), former Colorado Democratic Gov. John HickenlooperJohn HickenlooperDemocratic candidates face hard choices as 2020 field winnows If the Democratic debates were pro wrestling, de Blasio is comic relief Hickenlooper day-old Senate bid faces pushback from progressives MORE, Gov. Jay InsleeJay Robert InsleeDemocratic candidates face hard choices as 2020 field winnows The Hill's 12:30 Report: Stocks sink as Trump fights with Fed, China The Hill's Campaign Report: Democratic field begins to shrink ahead of critical stretch MORE (D-Washington), Rep. Eric SwalwellEric Michael SwalwellIf the Democratic debates were pro wrestling, de Blasio is comic relief Inslee seeking third term as governor after ending presidential bid The Hill's Morning Report - Trump touts new immigration policy, backtracks on tax cuts MORE (D-Calif.), former Sen. Mike Gravel (D-Alaska), Florida mayor Wayne MessamWayne Martin MessamDemocratic candidates face hard choices as 2020 field winnows 2020 Democrats release joint statement ahead of Trump's New Hampshire rally The Hill's 12:30 Report: Trump claims support in Congress for background checks MORE, and author Marianne WilliamsonMarianne WilliamsonMarianne Williamson on Trump: We have a little bit of a 'mad King George' in charge Democratic candidates face hard choices as 2020 field winnows The Hill's Campaign Report: Democratic field begins to shrink ahead of critical stretch MORE.

A large number of respondents, 19 percent, were undecided.

While she still trails the leading two candidates, Warren's support has increased across several different polls in recent weeks but it has come at Sanders' expense, Emma Vigeland, a correspondent with the progressive video network The Young Turks, told Hill.TV on Wednesday.

"Warren is rising and rightly so and she's cutting into that Bernie Sanders chunk which I believe is substantial and not going anywhere," she told "What America's Thinking" host Jamal Simmons.

Biden was more popular among women than among men. Thirty-nine percent of female respondents named the former vice president as their choice while 25 percent of male respondents said the same.

Sanders was the top choice for Democratic-leaning voters between the ages of 18 and 34 while Biden led among older age groups.

Nearly half of respondents (47 percent) who were 65 and older said the former veep was their choice. Biden was backed by 42 percent of participants between 50 and 64 and 35 percent of those between 35 and 49.

Among respondents who were 34 and younger, Sanders was the top pick of 24 percent. Thirteen percent chose Biden while 11 percent named Warren.

The former vice president fared better among respondents whose annual household income was $75,000 or greater than among those earning less than that amount.

Biden was preferred by 30 percent of respondents in the lower-income group and by 38 percent of respondents in the higher-income cohort.

Sanders was supported by 18 percent of Democratic-leaning voters with incomes less than $75,000 while only 8 percent of those earning more than this amount supported him.

The former vice president was the overwhelming favorite among respondents who classified themselves as "moderate" ideologically with 43 percent backing him. No other candidate received double-digit support from this group.

Biden was also the top pick among respondents who described themselves as politically liberal but by a much closer margin. Of the 221 participants who said they were either "strong" or "lean" liberals, the former veep was named by 28 percent while 17 percent named Sanders and 13 percent chose Warren.

Those findings echo earlier polls which indicate that Democratic voters place a much greater priority on defeating President TrumpDonald John TrumpGraham: America must 'accept the pain that comes in standing up to China' Weld 'thrilled' more Republicans are challenging Trump New data challenges Trump's economic narrative MORE in 2020 than on ideological agreement. A May 10-11 Hill-HarrisX survey found that 65 percent of Democrats or independents who leaned toward the party said they would pick a candidate they believed had a stronger chance of winning the general election over one who agreed with them on their top policy issue.

A March USA Today-Suffolk University poll had similar findings, as did an April survey commissioned by a Pennsylvania newspaper of registered Democrats living in the state.

The latest Hill-HarrisX survey was conducted May 17-18 among a statistically representative online panel of 1,030 registered voters with a 95 percent confidence level and a sampling margin of error of 3.1 percentage points. The 2020 Democratic presidential preference question was asked of a subset of 448 respondents who identified as Democrats or as independents who favored the Democratic Party. The sampling margin of error for the subset is 4.6 percentage points.

—Matthew Sheffield