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

Former Vice President Joe BidenJoe BidenMellman: Trump voters cling to 2020 tale FDA authorizes another batch of J&J vaccine Cotton warns of China collecting athletes' DNA at 2022 Olympics 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 HarrisDemocrats learn hard truths about Capitol breach Harris calls for pathway to citizenship for Dreamers on DACA anniversary Abbott says he'll solicit public donations for border wall MORE (D-Calif.), Elizabeth WarrenElizabeth WarrenProgressives rave over Harrison's start at DNC On The Money: Schumer to trigger reconciliation process on Wednesday | Four states emerge as test case for cutting off jobless benefits Big Tech critic Lina Khan named chair of the FTC MORE (D-Mass.) and Bernie SandersBernie SandersProgressives rave over Harrison's start at DNC Zombie Tax punishes farmers to fill DC coffers Progressives threaten to block bipartisan infrastructure proposal 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 ButtigiegPete ButtigiegHigh-speed rail getting last minute push in Congress Buttigieg: Bipartisan deal on infrastructure 'strongly preferred' OVERNIGHT ENERGY: Biden ends infrastructure talks with key Republican | Colonial Pipeline CEO grilled over ransomware attack | Texas gov signs bills to improve power grid after winter storm 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.