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

White House hopeful Joe BidenJoe BidenDemocrats worry they don't have right candidate to beat Trump Trump threatening to fire Mulvaney: report Giuliani pens op-ed slamming 'unprecedented' impeachment inquiry 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 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.), who placed second with 20 percent support.

Sen. Elizabeth WarrenElizabeth Ann WarrenDemocrats worry they don't have right candidate to beat Trump Overnight Energy: BLM staff face choice of relocation or resignation as agency moves | Trump says he's 'very much into climate' | EPA rule would expand limits on scientific studies Krystal Ball credits Gabbard's upswing in 2020 race to 'feckless' Democratic establishment 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 Devi HarrisOutsider candidates outpoll insider candidates Poll: Buttigieg leads Democratic field in Iowa Press: Another billionaire need not apply MORE (D-Calif.) fell 4 points to 11 percent.

The only other candidates above 3 percent were 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 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 BookerOutsider candidates outpoll insider candidates The Hill's Campaign Report: Bloomberg looks to upend Democratic race Poll: Biden support hits record low of 26 percent 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.