Poll: Biden holds 19-point lead over 2020 Democratic field, Warren places second

Poll: Biden holds 19-point lead over 2020 Democratic field, Warren places second

Former Vice President Joe BidenJoe BidenTrump second-term plans remain a mystery to GOP Susan Rice: Trump picks Putin over troops 'even when it comes to the blood of American service members' Does Donald Trump even want a second term? MORE widened his lead in the 2020 Democratic presidential primary to 19 points over second-placed Sen. Elizabeth WarrenElizabeth WarrenSusan Rice sees stock rise in Biden VP race The Hill's Campaign Report: Biden chips away at Trump's fundraising advantage Warnock raises almost M in Georgia Senate race in second quarter MORE (D-Mass.), according to the latest Quinnipiac poll released Monday.

Biden widened his lead after the previous Quinnipiac Poll on July 2 showed Biden's lead over then second-placed candidate Sen. Kamala HarrisKamala Devi HarrisSusan Rice sees stock rise in Biden VP race Jaime Harrison seeks to convince Democrats he can take down Lindsey Graham Senators push foreign media to disclose if they are registered as foreign agents MORE (D-Calif.) had shrunk to just two points shortly after the first Democratic primary debate.

Warren placed second in the latest Quinnipiac poll with 15 percent support, up from third in the July 2 poll.

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Warren was followed closely by Sen. Kamala Harris (D-Calif.), at third with 12 percent support, and Sen. Bernie SandersBernie SandersThe Memo: Unhappy voters could deliver political shocks beyond Trump Democratic senator will introduce bill mandating social distancing on flights after flying on packed plane Neil Young opposes use of his music at Trump Mount Rushmore event: 'I stand in solidarity with the Lakota Sioux' MORE (I-Vt.), at fourth with 11 percent support.

In the July 2 poll, Harris had placed second, with 20 percent support, after confronting Biden over the former vice president's policy opposition to federally mandated busing during desegregation, while Warren was at third, with 14 percent support.

South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegDemocratic lawmakers call for expanding, enshrining LGBTQ rights Democrats debate Biden effort to expand map against Trump The Hill's Morning Report - Presented by Facebook - Dems, GOP dig in on police reform ahead of House vote MORE (D) again placed fifth, polling at 6 percent. 

All other candidates in the crowded field are polling at 2 percent or less. 

The latest Quinnipiac poll was released just ahead the second presidential primary debates set to take place over Tuesday and Wednesday. 

The Democrats will face-off again in two debates this week, 10 on Tuesday and 10 on Wednesday, in Detroit. 

Sanders and Warren will be on the same stage the first night, while Biden and Harris will again be on stage together at Wednesday’s debate. 

The poll was conducted from July 25 to 28 and surveyed 1,306 voters nationwide. There is a 3.4 percentage point margin of error.