Former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE and Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) both gained ground in early voting states, according to a poll released Monday.

The Morning Consult poll found Biden reached 33 percent support and Sanders earned the backing of 22 percent in the early primary states: Iowa, New Hampshire, North Carolina and Nevada. Both experienced 4 percentage point gains since last week’s poll.

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The front-runners in the early primary states are followed by philanthropist Tom Steyer Tom SteyerTV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' OVERNIGHT ENERGY: Trump administration finalizes plan to open up Alaska wildlife refuge to drilling | California finalizes fuel efficiency deal with five automakers, undercutting Trump | Democrats use vulnerable GOP senators to get rare win on environment MORE at 6 percent, Sen. Kamala Harris Kamala HarrisTexas Democratic official urges Biden to visit state: 'I thought he had his own plane' The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements A game theorist's advice to President Trump on filling the Supreme Court seat MORE (D-Calif.) at 5 percent, Rep. Tulsi Gabbard Tulsi GabbardRepublicans call on DOJ to investigate Netflix over 'Cuties' film Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Gabbard says she 'was not invited to participate in any way' in Democratic convention MORE (D-Hawaii) at 3 percent and entrepreneur Andrew Yang Andrew YangBiden's latest small business outreach is just ... awful Doctor who allegedly assaulted Evelyn Yang arrested on federal charges The Hill's Campaign Report: Biden weighs in on police shootings | Who's moderating the debates | Trump trails in post-convention polls MORE at 2 percent.

Overall, Democratic voters from across the country back Biden at a rate of 32 percent, according to Morning Consult's findings. Sanders and Warren follow at 20 percent support. All three of the candidates did not experience any percentage point changes nationally from last week’s poll.

The former vice president has retained his top spot in most national polls, but Warren and Sanders have gained an edge on him in recent weeks. Buttigieg has also risen in the polls, solidifying his place in fourth.

The Morning Consult poll conducted 16,071 interviews with registered voters indicating they would vote in a Democratic primary or caucus. The interviews were conducted between Oct. 28 and Nov. 3, and the results have a margin of error of 1 percentage point. The margin of error for the voters from early primary states specifically had a margin of error of 4 percentage points.