Sen. Elizabeth WarrenElizabeth Ann WarrenUniversity of Florida student government president faces impeachment over Trump Jr. appearance The Hill's Morning Report - Diplomats kick off public evidence about Trump, Ukraine Democrats worry they don't have right candidate to beat Trump MORE (D-Mass.) topped progressive rival Sen. Bernie SandersBernie SandersDemocrats worry they don't have right candidate to beat Trump Overnight Health Care: Top health official defends contract payments to Trump allies | Vaping advocates confident Trump will turn from flavor ban | Sanders gets endorsement from nurses union Krystal Ball credits Gabbard's upswing in 2020 race to 'feckless' Democratic establishment MORE (I-Vt.) in a new national poll released on Tuesday.

The Hill-HarrisX survey showed that 19 percent of Democrats and Democratic-leaning independents backed Warren, a 4-point increase from an Oct.6-7 poll conducted before last week’s Democratic debate in Ohio.

Sanders’ support, meanwhile, dipped from 17 percent to 14 percent among those polled. 

However, Vice President Joe BidenJoe BidenLindsey Graham vows to not watch 'un-American' Trump impeachment hearings University of Florida student government president faces impeachment over Trump Jr. appearance 'Ok, boomer' is much more than a meme MORE still maintained his lead over the two progressive candidates at 27 percent support.

South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegDemocrats worry they don't have right candidate to beat Trump Saagar Enjeti rips Buttigieg for praising Obama after misquote Krystal Ball credits Gabbard's upswing in 2020 race to 'feckless' Democratic establishment MORE saw a boost in the poll, rising to fourth place with 6 percent support followed by Sen. Kamala HarrisKamala Devi HarrisThe Hill's Morning Report - Diplomats kick off public evidence about Trump, Ukraine Outsider candidates outpoll insider candidates Poll: Buttigieg leads Democratic field in Iowa MORE (D-Calif.) with 5 percent and former Rep. Beto O’Rourke (D-Texas) with 3 percent.

Entrepreneur Andrew YangAndrew YangOutsider candidates outpoll insider candidates Is Andrew Yang's pivot working? New Quinnipiac poll finds Biden leading in New Hampshire MORE drew 2 percent. The rest of the White House contenders running in the Democratic primary polled at 1 percent or less.

Thirteen percent said they were unsure. 

The survey comes a week after 12 Democratic contenders took the debate stage for the fourth Democratic primary debate, where Warren leaned into her new front-runner status and fended off attacks from rivals.

Centrist candidates, including South Bend, Ind., Mayor Pete Buttigieg (D) and Sen. Amy KlobucharAmy Jean KlobucharGoogle sparks new privacy fears over health care data Krystal Ball credits Gabbard's upswing in 2020 race to 'feckless' Democratic establishment Outsider candidates outpoll insider candidates MORE (D-Minn.), accused the progressive heavyweight of not being transparent with voters about her plan’s cost, specifically over whether it would include tax hikes on the middle class.

Though Warren largely dodged questions about her plan’s cost during the debate, Warren said over the weekend that she would soon release a proposal detailing how she would pay for her main health care plan.

Medicare for All has emerged as a leading point of contention among White House hopefuls.

While the progressive wing of the party has doubled down on its support, more moderate candidates have increasingly gone on the attack.

The Hill-HarrisX poll surveyed 1,0001 registered voters between Oct. 21 and Oct. 22. The margin of error is plus or minus 3.1 percentage points.

—Tess Bonn