Poll: Biden leads 2020 Democratic pack by 15 points, Warren, Harris, Sanders tie for second

Former Vice President Joe BidenJoe BidenTrump denies telling Bolton Ukraine aid was tied to investigations Former senior Senate GOP aide says Republicans should call witnesses Title, release date revealed for Bolton memoir MORE holds a commanding lead over his Democratic presidential opponents, according to a new poll.

A new survey from Emerson Polling found that Biden had the support of 30 percent of respondents, beating out Sens. Kamala HarrisKamala Devi HarrisBiden leads 2020 pack in congressional endorsements Harris on 2020 endorsement: 'I am not thinking about it right now' Panel: Is Kamala Harris a hypocrite for mulling a Joe Biden endorsement? MORE (D-Calif.), Elizabeth WarrenElizabeth Ann WarrenPoll: Sanders leads Biden by 9 points in Iowa Poll: Biden leads in Iowa ahead of caucuses The Memo: Impeachment dominates final Iowa sprint MORE (D-Mass.) and Bernie SandersBernie SandersPoll: Sanders leads Biden by 9 points in Iowa Poll: Biden leads in Iowa ahead of caucuses The Memo: Impeachment dominates final Iowa sprint MORE (I-Vt.) who all tied for second place with support from 15 percent of those polled. 

Since the last poll released in June, overall support for Biden had dropped from 34 percent, but he extended his lead over Sanders, whose support fell from 27 percent last month.

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South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegPoll: Sanders leads Biden by 9 points in Iowa Buttigieg on polarization: 'We don't have to choose between being bold and being unified' Buttigieg: America 'united in mourning' Kobe Bryant's death MORE (D) trailed the top four with support from just 5 percent of respondents. 

Spencer Kimball, director of Emerson Polling, said in a statement that “these numbers suggest that the Democratic field is still fluid and that Biden will need to improve upon his performance to maintain his lead.”

A majority, 60 percent of respondents, said they are not completely set on the candidate they chose, while 41 percent said they will definitely vote for their choice. 

Researchers surveyed, between July 6 and 8, 481 registered Democratic voters who said they plan to vote in the Democratic primary or caucus in 2020. The survey has a margin of error of plus or minus 4.4 percentage points.