Former Vice President Joe BidenJoe BidenBiden bemoans white supremacy in remarks at civil rights movement site Gun control: Campaigning vs. legislating Sunday shows - Guns dominate after Democratic debate 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 SandersGun control: Campaigning vs. legislating Booker defends middle-ground health care approach: 'We're going to fight to get there' Sunday shows preview: Democratic candidates make the rounds after debate MORE (I-Vt.), at 13 percent.

Sen. Elizabeth WarrenElizabeth Ann WarrenGun control: Campaigning vs. legislating Booker defends middle-ground health care approach: 'We're going to fight to get there' Democrats spar over electoral appeal of 'Medicare for All' MORE (D-Mass.) came in third with 7 percent, followed by former Rep. Beto O'RourkeBeto O'RourkeO'Rourke responds to Buttigieg's gun criticism: 'That calculation and fear is what got us here in the first place' Sunday shows - Guns dominate after Democratic debate O'Rourke says pushback to his mandatory gun buyback proposal shows Washington's 'screwed up priorities' MORE (D-Texas) at 6 percent, Sen. Kamala HarrisKamala Devi HarrisHarris bashes Kavanaugh's 'sham' nomination process, calls for his impeachment after sexual misconduct allegation Gun control: Campaigning vs. legislating Booker defends middle-ground health care approach: 'We're going to fight to get there' MORE (D-Calif.) at 5 percent and South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegO'Rourke responds to Buttigieg's gun criticism: 'That calculation and fear is what got us here in the first place' Buttigieg: Biden gave 'bad' debate answer on slavery's legacy O'Rourke's debate moment reignites gun debate on Sunday shows MORE at 4 percent.

New Jersey Democratic Sen. Cory BookerCory Anthony BookerSunday shows - Guns dominate after Democratic debate Booker defends middle-ground health care approach: 'We're going to fight to get there' Sunday shows preview: Democratic candidates make the rounds after debate 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 BlasioAt debate, Warren and Buttigieg tap idealism of Obama, FDR De Blasio calls out Andrew Yang over Puerto Rico flub at debate The Hill's 12:30 Report: House panel approves impeachment powers MORE (D), former Colorado Gov. John HickenlooperJohn HickenlooperLeft off debate stage, Bullock all-in on Iowa Yang says he would not run as a third-party candidate The Hill's Morning Report - Hurricane Dorian devastates the Bahamas, creeps along Florida coast MORE (D), Washington Gov. Jay InsleeJay Robert InsleeThe Hill's Campaign Report: Democrats clash over future of party in heated debate 5 takeaways from fiery Democratic debate Left off debate stage, Bullock all-in on Iowa 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