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

Sen. Elizabeth WarrenElizabeth Ann WarrenBiden says he won't legalize marijuana because it may be a 'gateway drug' Democrats seize on report of FedEx's Elizabeth Warren tax bill to slam Trump's tax plan Warren 'fully committed' to 'Medicare for All' 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 BidenSondland notified Trump officials of investigation push ahead of Ukraine call: report Biden says he won't legalize marijuana because it may be a 'gateway drug' Impeachment hearings don't move needle with Senate GOP 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 SandersBiden says he won't legalize marijuana because it may be a 'gateway drug' Democrats seize on report of FedEx's Bernie Sanders tax bill to slam Trump's tax plan If we want to save earth, we need to change how we eat MORE (I-Vt.) was the only other candidate to register double digit support, at 14 percent, while South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegWarren 'fully committed' to 'Medicare for All' New poll shows four top-tier 2020 candidates in Iowa The Democratic race for president may not sort itself out MORE and Sen. Kamala HarrisKamala Devi HarrisIf we want to save earth, we need to change how we eat New poll shows four top-tier 2020 candidates in Iowa The Democratic race for president may not sort itself out 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