These charts are from a new Morning Consult Poll. It was done between April 1st and 7th of a national sample of 12,940 registered voters likely to vote in a Democratic primary or caucus. Because of the large sample, the margin of error is only 1 point.
The top chart shows the nine candidates who are currently leading the field -- from Biden with 32% to Gillibrand and Klobuchar with 2%.
The chart below shows the favorability rating of each candidate. As you can see, there are quite a few candidates that aren't very well known to the public. Can they improve their standing in the next few months? We shall see.