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 BidenPoll: Bloomberg stalls after Vegas debate Bloomberg campaign: Vandalism at Tennessee office 'echoes language from the Sanders campaign and its supporters' Democratic strategist says Biden 'has to' get second place in Nevada MORE widened his lead in the 2020 Democratic presidential primary to 19 points over second-placed Sen. Elizabeth WarrenElizabeth Ann WarrenPoll: Bloomberg stalls after Vegas debate Bloomberg unveils billboards to troll Trump ahead of campaign stops John Legend joining Warren in South Carolina next week: report 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 HarrisHouse to vote on legislation to make lynching a federal hate crime Overnight Energy: EPA to regulate 'forever chemicals' in drinking water | Trump budget calls for slashing funds for climate science centers | House Dems urge banks not to fund drilling in Arctic refuge Democratic senators criticize plan that could expand Arctic oil and gas development 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 SandersPoll: Bloomberg stalls after Vegas debate Prominent Texas Latina endorses Warren Bloomberg campaign: Vandalism at Tennessee office 'echoes language from the Sanders campaign and its supporters' 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 ButtigiegPeter (Pete) Paul ButtigiegPoll: Bloomberg stalls after Vegas debate Bloomberg campaign: Vandalism at Tennessee office 'echoes language from the Sanders campaign and its supporters' Buttigieg to join striking South Carolina McDonald's workers next week 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.