This chart is from RealClearPolitics. It shows the results of the latest respected polls on the Democratic presidential nomination, and shows the RCP average of those recent polls.
Joe Biden has about a 10 point lead in the average over Sanders, a 15 point lead over Warren, a 21 point lead over Buttigieg, and a 23 point lead over Bloomberg. Those are the only candidates with at least a 4% average.
With a month to go before the voting begins, the polls on this race seem pretty stable. Not much has changed in the last few weeks.
