Former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE maintained a healthy lead over the Democratic primary field, though Sens. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.) and Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.) posted big gains in the latest Monmouth University poll.

The survey finds Biden at 33 percent support, up from 27 percent lasts month. Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.) has been on a steady decline, falling from 25 percent in March to 20 percent in April and 15 percent in the latest survey.

Harris has moved into third place with 11 percent support, up from 8 percent in April, while Warren is close behind at 10 percent, up from 6 percent last month.

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South Bend, Ind. Mayor Pete Buttigieg Pete ButtigiegThe Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice Hillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield MORE has fallen by 2 points, to 6 percent support. But another female candidate, Sen. Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (Minn.), has tripled her support, rising from 1 percent last month to 3 percent in May.

About half of the Democrats surveyed in the Monmouth poll come from states that will vote by Super Tuesday on March 3, 2020, and the women in the race fare even better among these early-voting states.

When the poll is narrowed to potential early voters, Biden’s support falls to 26 percent, followed by Sanders and Harris at 14 percent each. Rounding out the field are Warren at 9 percent, Buttigieg at 6 percent and Klobuchar at 5 percent.

All told, the six women running for president combine for 27 support, up from 16 percent in the prior survey.

“Women are commanding a larger slice of Democratic support than they were a few weeks ago and we are seeing bumps in their individual voter ratings,” said Monmouth University pollster Patrick Murray. “We can’t parse out the exact reasons from this one poll, but recent efforts by certain states to restrict access to abortion services may be playing a role in the closer look these candidates are getting right now.”

Biden still has the best favorability in the field, but the women in the race have become more popular in the past month.

Warren is known by 88 percent of Democratic voters, with 60 percent having a favorable view of her against only 14 percent who view her unfavorably. That’s up from a 51-19 split in the prior survey.

Harris is known by 82 percent of Democratic voters, with 58 percent holding a favorable view and 9 percent viewing her unfavorably. In the prior survey, Harris’s favorability rating was 50 percent positive and 10 percent negative.

The Monmouth University survey of 334 registered Democrats was conducted between May 15 and May 20 and has a margin of error of plus or minus 5.4 percentage points.