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Biden holds big lead over 2020 Democrats in two new national polls

White House hopeful Joe BidenJoe BidenGiuliani goes off on Fox Business host after she compares him to Christopher Steele Trump looks to shore up support in Nebraska Jeff Daniels narrates new Biden campaign ad for Michigan MORE holds big leads over the Democratic primary field in two national polls released Tuesday.

Emerson's latest poll found the former vice president was the top choice of 33 percent of likely Democratic voters, 13 points ahead of Sen. Bernie SandersBernie SandersIntercept bureau chief says congressional progressives looking to become stronger force in 2021 Obama book excerpt: 'Hard to deny my overconfidence' during early health care discussions Americans have a choice: Socialized medicine or health care freedom MORE (I-Vt.), who placed second with 20 percent support.

Sen. Elizabeth WarrenElizabeth WarrenOvernight Defense: Dems want hearing on DOD role on coronavirus vaccine | US and India sign data-sharing pact | American citizen kidnapped in Niger Conservative operatives Wohl, Burkman charged in Ohio over false robocalls Senate Democrats want hearing on Pentagon vaccine effort MORE (D-Mass.) finished third in the survey at 14 percent support. 

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While Sanders gained 5 points since Emerson's last survey, Kamala HarrisKamala HarrisBiden pushes into Trump territory The Hill's Campaign Report: One week from Election Day | Biden looks to expand map | Trump trails narrowly in Florida, Arizona The Hill's 12:30 Report - Presented by Facebook - One week out, where the Trump, Biden race stands MORE (D-Calif.) fell 4 points to 11 percent.

The only other candidates above 3 percent were South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegConservative operatives Wohl, Burkman charged in Ohio over false robocalls LGBTQ voters must show up at the polls, or risk losing progress Buttigieg says it's time to 'turn the page' on Trump administration MORE at 6 percent and former Rep. Beto O’Rourke (D-Texas) at 4 percent.

Morning Consult's weekly survey also found Biden as the top choice of voters at 33 percent, leading Sanders, who also placed second in this survey with 18 percent support, 15 points behind Biden. 

Warren at 13 percent and Harris at 12 percent were in a close race for third in this survey as well.

Buttigieg at 5 percent, O'Rourke at 3 percent and 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 (D-N.J.) at 3 percent were the only other candidates above 2 percent.

The polls come just before 20 of the Democratic candidates are set to take the stage for the second primary debate, with 10 participating on Tuesday night and another 10 participating on Wednesday night.

The polls taken together show Biden recovering from a polling dip after the first presidential debate, where he was widely seen as having delivered an uneven performance.

Harris, whose questioning of Biden on federally mandated busing during the debate drew headlines, has fallen slightly but still gained from her predebate position.

Sanders also seems to have moved up in the weeks following the debate. 

Emerson surveyed 520 Democratic primary voters between July 27 and July 29, with a margin of error of 4.2 percentage points.

Morning Consult surveyed 16,959 registered voters who may vote in the primary between July 22 and July 28, with a margin of error of 1 percentage point.

A Hill-HarrisX poll released Tuesday has a similar distribution of the top four candidates' support. 

This report was updated at 11:31 a.m.