Warren had the support of 24 percent of registered Democrats and Democratic-leaning independent voters, based on an IBD/TIPP poll released Tuesday, marking a 7-point uptick for the senator since an August poll.
By contrast, Biden saw a 2 point decrease in his support, leaving it at 28 percent. He now leads Warren by just 4 points, compared to a 13 point difference in the previous poll.
Biden's lead over Warren in the IBD/TIPP survey is smaller than in some other national polls. A RealClearPolitics average of polls has Biden's support at 30.1 percent, a 12.7 point lead over Warren’s 17.4 percent.
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