The chart above reflects the results of the latest Economist / YouGov Poll -- done between September 28th and October 1st of a national sample of 602 Democrats/Leaners (including 546 registered voters).
This poll has shown Elizabeth Warren's support growing for a few weeks now. Last week, she tied Joe Biden for fist place for the first time (with each showing 25% support). This week, she has taken the lead. She has a 4 point advantage over Biden among adults, and a 6 point advantage among registered voters. Bernie Sanders trails her by 12 points among all adults and by 15 points among registered voters. All others are far behind those three.
NOTE -- I included in this chart only the candidates getting at least 2% support.