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That's not what the public polls reflect, though. Biden is generally still No. 1, often by a fairly comfortable margin, in polls of voters who are paying the most attention to the campaign and/or are most likely to vote.
Warren and Buttigieg do tend to move up in samples of highly attentive voters, whereas Sanders tends to move down. So there are some shifts. But not enough to knock Biden out of No. 1 and a lot of his voters are from groups (65+, black) that turn out at high rates in primaries.
