Warren passes Biden to lead 2020 Democrats by 4 points in weekly national poll

Sen. Elizabeth WarrenElizabeth WarrenWarren, Daines introduce bill honoring 13 killed in Kabul attack Boston set to elect first female mayor Progressive groups call for Puerto Rico Fiscal Control Board to be abolished MORE (D-Mass.) leads the Democratic primary field by 4 points in the latest Economist/YouGov weekly tracking survey, leapfrogging former Vice President Joe BidenJoe BidenOvernight Defense & National Security — Milley becomes lightning rod Democrats hope Biden can flip Manchin and Sinema On The Money — Presented by Wells Fargo — Democrats advance tax plan through hurdles MORE as she continues to enjoy a boost in the polls. 

Twenty-six percent of respondents who say they will vote in their Democratic presidential primary or caucus said Warren is their first choice, a 1-point bump from last week’s survey, while 22 percent said the same for Biden, down from 25 percent last week.

Sen. Bernie SandersBernie SandersWarren, Daines introduce bill honoring 13 killed in Kabul attack trillion tax hike the opposite of 'good investment' Progressive groups call for Puerto Rico Fiscal Control Board to be abolished MORE (I-Vt.) was the only other candidate to register double digit support, at 14 percent, while South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegPete and Chasten Buttigieg welcome twins Coalition urges Democrats to restore billion in transit funding Say it ain't so, Joe MORE and Sen. Kamala HarrisKamala HarrisLive coverage: California voters to decide Newsom's fate Florida woman faces five years in prison for threatening to kill Harris Australia's COVID overreaction could come to US MORE (D-Calif.) rounded out the top five at 7 percent and 5 percent, respectively.

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Warren topped the poll in part by chewing into key demographics for Biden and Sanders. The Massachusetts lawmaker cut her deficit on Biden to 2 points among voters aged 65 years and older and is only behind Sanders by 3 points among voters aged 18-29. She also leads among white voters with 31 percent support, compared to 18 percent for Biden and 13 percent for Sanders.

Warren also edges out Biden by 5 points among self-identified Democrats, 28 percent to 23 percent, though the poll shows a stiff competition for independents, with both Warren and Biden coming in at 20 percent and Sanders getting 18 percent among such voters. 

However, she still struggles with voters of color, trailing Biden by a 36-15 percent margin among black voters and by a 22-17 percent margin among Hispanics. 

Wednesday's survey matches similar polling that has signaled a new division within the primary field, with Warren, Biden and Sanders making up its top tier while relegating candidates like Harris, Buttigieg and others to its middle tier.

The Economist/YouGov poll surveyed 1,087 registered voters from Sept. 28-Oct. 1 and has a margin of error of 3.1 percentage points.

Chris Mills Rodrigo contributed to this report