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Biden maintains 19-point lead over Sanders in new poll

Former vice president Joe BidenJoe BidenBiden administration still seizing land near border despite plans to stop building wall: report Olympics, climate on the agenda for Biden meeting with Japanese PM Boehner on Afghanistan: 'It's time to pull out the troops' MORE leads Sen. Bernie SandersBernie SandersSanders: Trump was right about 'trying to end endless wars' Democrats battle over best path for Puerto Rico Bernie Sanders says he disagrees with Tlaib's call for 'no more police' MORE in the latest Hill-HarrisX poll released Monday by 19 points, maintaining a clear separation from the rest of the field in the Democratic presidential primary,

Biden won 35 percent support from Democratic and Democratic-leaning independent registered voters in the June 1-2 survey, compared to 16 percent for Sanders (I-Vt.).

South Bend, Ind. Mayor Pete ButtigiegPete ButtigiegWhite House says gas tax won't be part of infrastructure bill The Hill's 12:30 Report: Biden meets with bipartisan lawmakers for infrastructure negotiations Senate Republicans label Biden infrastructure plan a 'slush fund' MORE was a distant third with 8 percent. He was followed by Sen. Elizabeth WarrenElizabeth WarrenDemocrats reintroduce bill to block US from using nuclear weapons first CEO who gave employees K minimum wage says revenue tripled 6 years later Forgiving K in school loans would free 36 million student borrowers from debt: data MORE (D-Mass) at 5 percent.

Sen. Kamala HarrisKamala HarrisThe Hill's 12:30 Report: Biden defends Afghanistan withdrawal after pushback Scalise carries a milk carton saying Harris is 'missing' at the border Harris to visit Mexico and Guatemala 'soon' MORE (D-Calif.) and former Rep. Beto O'RourkeBeto O'RourkeO'Rourke clarifies remarks, leaves door open to gubernatorial bid O'Rourke says he's not planning on run for Texas governor O'Rourke slams Cruz for video of border visit MORE were supported by 4 percent of respondents while Sen. Cory BookerCory BookerProgressive lawmakers press DHS chief on immigration detention Democrats battle over best path for Puerto Rico Biden's DOJ civil rights nominee faces sharp GOP criticism MORE (D-N.J.) was named by 3 percent.

All of the other Democratic candidates were named by 1 percent or fewer survey participants. Seventeen percent of respondents said they were unsure about their preference.

The results overall are largely similar to a May 17-18 Hill-HarrisX survey which also found Biden with a 19 percent lead over his Vermont-based rival. The former vice president received 33 percent support in the earlier poll while Sanders received 14 percent.

The May survey showed Warren in third place with 8 percent support and Buttigieg in fourth with 6 percent. The shift between the two candidates' support within the polls is within the surveys' sampling margins of error.

The newer poll found Biden as the top named candidate of both men and women and also across all age groups, although his lead over Sanders among voters between 18 and 34 was just one point, indicating a statistical tie. Older voters were overwhelmingly more likely to prefer the former vice president to other candidates with 47 percent of respondents 50 years old and older supporting him.

Among white voters, Biden was the preferred candidate while Sanders and Buttigieg were essentially tied for second-place. Biden enjoyed an even stronger lead among black respondents while Sanders showed strength among Hispanics although the sample size for both groups is too small to state this definitively.

Since Biden's entry into the presidential contest in April, the race has become relatively stable with no candidate able to dislodge Sanders from second-place and Biden from first, although that may change following the first debate contest which will be hosted by the Democratic National Committee June 26 and 27.

Presidential aspirants sharpened their messages over the weekend at the California Democratic Party's annual convention in San Francisco where several candidates called for impeaching President TrumpDonald TrumpBiden administration still seizing land near border despite plans to stop building wall: report Illinois House passes bill that would mandate Asian-American history lessons in schools Overnight Defense: Administration says 'low to moderate confidence' Russia behind Afghanistan troop bounties | 'Low to medium risk' of Russia invading Ukraine in next few weeks | Intelligence leaders face sharp questions during House worldwide threats he MORE. Former Colorado Gov. John HickenlooperJohn HickenlooperOn The Trail: How marijuana went mainstream Senators press for answers in Space Command move decision Senate rejects Cruz effort to block stimulus checks for undocumented immigrants MORE was booed by attendees after he expressed skepticism about a proposed Green New Deal environmental initiative and proposals to have the federal government administer medical insurance for all Americans.

Warren and Buttigieg took veiled swipes at Biden at the event with the Massachusetts senator implicitly denouncing his recent declarations that Republicans would become more inclined toward bipartisanship if President Trump is defeated in 2020. Buttigieg said that Democrats needed "a new generation of leaders," a reference to Biden's age of 76 years.

Sanders indirectly slammed Biden for skipping the event and argued that the party would not be able to defeat Trump unless it embraced a progressive agenda.

The latest Hill-HarrisX survey was conducted June 1-2 among a statistically representative sample of 1,001 registered voters. The question about 2020 Democratic presidential preference was asked of a subset of 431 respondents who said they were Democrats or independents who leaned toward the Democratic Party.

The larger survey has a 3.1 percent sampling margin of error and a 95 percent confidence level. The subset has a sampling margin of error of 4.7 percentage points.

—Matthew Sheffield