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Former Vice President Joe BidenJoe BidenBiden eyes bigger US role in global vaccination efforts Trump says GOP will take White House in 2024 in prepared speech Kemp: Pulling All-Star game out of Atlanta will hurt business owners of color MORE leads his closest competitor in the field of Democratic presidential candidates by 22 percentage points, according to a Hill-HarrisX poll released Monday.

In the June 14-15 survey, Biden garnered support from 35 percent of registered voters who identified as Democrats or as independents who favored the party. The next closest candidate was Sen. Bernie SandersBernie SandersHillicon Valley: Amazon wins union election — says 'our employees made the choice' On The Money: Biden .5T budget proposes major hike in social programs | GOP bashes border, policing provisions Overnight Defense: Biden proposes 3B defense budget | Criticism comes in from left and right | Pentagon moves toward new screening for extremists MORE (I-Vt.), at 13 percent.

Sen. Elizabeth WarrenElizabeth WarrenOn The Money: Biden .5T budget proposes major hike in social programs | GOP bashes border, policing provisions Overnight Defense: Biden proposes 3B defense budget | Criticism comes in from left and right | Pentagon moves toward new screening for extremists POW/MIA flag moved back atop White House MORE (D-Mass.) came in third with 7 percent, followed by 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 (D-Texas) at 6 percent, Sen. Kamala HarrisKamala HarrisPelosi planned on retiring until Trump won election: report How Kamala Harris can find the solution for the migration crisis White House unveils official portraits of Biden and Harris MORE (D-Calif.) at 5 percent and South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegSunday shows preview: Democrats eye two-part infrastructure push; Michigan coronavirus cases surge Buttigieg hopes cruises will return by mid-summer Biden to host bipartisan talks on infrastructure next week MORE at 4 percent.

New Jersey Democratic Sen. Cory BookerCory BookerThe first Southern state legalizes marijuana — what it means nationally Top Democrat calling for expansion of child care support When it comes to the Iran nuclear deal, what's a moderate Democrat to do? MORE drew 3 percent support, while former Housing and Urban Development Secretary Julián Castro was named by 2 percent.

All other candidates who were named by poll participants received 1 percent support or less. Several were not named by any participants: New York Mayor Bill de BlasioBill de BlasioNew York City's suicide mission should alarm the entire nation How education entitlements can worsen racial disparities Five states account for nearly 44 percent of new US COVID-19 cases MORE (D), 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 (D), Washington Gov. Jay InsleeJay Robert InsleeInslee signs bill restoring voting rights to parolees in Washington state Biden clean electricity standard faces high hurdles On The Trail: How marijuana went mainstream MORE (D) and former Sen. Mike Gravel (D-Alaska).

Biden's 35 percent matches the support rating he received in a Hill-HarrisX survey conducted June 1-2. In that poll, Sanders had 16 percent support.

Biden was slightly more popular among male respondents than among female voters in the most recent survey, with 37 percent of men favoring him compared to 32 percent of women.

For Sanders, 16 percent of men supported him, compared to support from 10 percent of women.

Harris received more support from female respondents than males, with 8 percent of women backing her compared to 2 percent of men.

Biden had support from 22 percent of Hispanic respondents, compared with 15 percent for Sanders 13 percent for O'Rourke and 10 percent for Harris. In the previous poll, Biden and Sanders were tied among Latino respondents at 25 percent.

The former vice president fared much better among African-American voters, with 42 percent support. None of the other candidates received double-digit support. In the previous three surveys, Biden was the overwhelming favorite among black respondents.

Biden has also maintained an edge among white Democratic voters, at 36 percent. Sanders was next at 12 percent, followed by 9 percent for Warren.

The June 14-15 Hill-HarrisX poll was conducted online among a statistically representative sample of 424 respondents who identified themselves as registered voters who were Democrats or independents who favored the Democratic Party. It has a sampling margin of error of 4.8 percent and a 95 percent confidence level.

—Matthew Sheffield