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Former Vice President Joe BidenJoe BidenMore than 300 military family members endorse Biden Five takeaways from the final Trump-Biden debate Biden: 'I would transition from the oil industry' 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 SandersBiden defends his health plan from Trump attacks Progressives blast Biden plan to form panel on Supreme Court reform Sanders: Progressives will work to 'rally the American people' if Biden wins MORE (I-Vt.), at 13 percent.

Sen. Elizabeth WarrenElizabeth WarrenBiden defends his health plan from Trump attacks Progressives blast Biden plan to form panel on Supreme Court reform Biden endorses Texas Democratic House candidate Julie Oliver MORE (D-Mass.) came in third with 7 percent, followed by former Rep. Beto O'RourkeBeto O'RourkeCalls grow for Democrats to ramp up spending in Texas Texas Dems highlight health care in fight to flip state House Union leader vows 'infrequent' minority voters will help deliver Biden victory MORE (D-Texas) at 6 percent, Sen. Kamala HarrisKamala HarrisThe Hill's Campaign Report: Trump, Biden face off for last time on the debate stage Obama says he voted by mail: 'It's not as tough as a lot of folks think' Clean energy opportunities in a time of crisis MORE (D-Calif.) at 5 percent and South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegLGBTQ voters must show up at the polls, or risk losing progress Buttigieg says it's time to 'turn the page' on Trump administration Sunday shows preview: Coronavirus cases surge in the Midwest; Trump hits campaign trail after COVID-19 MORE at 4 percent.

New Jersey Democratic Sen. Cory BookerCory Anthony BookerDemocratic senators unveil bill to ban discrimination in financial services industry Obama endorses Espy in Mississippi Senate race Durbin says he will run for No. 2 spot if Dems win Senate majority 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 BlasioDe Blasio's obsession with racial balance in schools has a clear victim: Asian students Citigroup executive to run for NYC mayor: report Treasury withheld nearly M from FDNY 9/11 health program MORE (D), former Colorado Gov. John HickenlooperJohn HickenlooperBiden and Schumer face battles with left if Democrats win big Push to expand Supreme Court faces Democratic buzzsaw Democratic super PAC pulls remaining ads from Colorado Senate race MORE (D), Washington Gov. Jay InsleeJay Robert InsleeOn The Trail: A third coronavirus wave builds just before Election Day Democrats seem unlikely to move against Feinstein Pandemic politics dominate competitive governor's races 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