Politics Magazine
These charts are from a new CBS News / YouGov Poll in the early voting states of Iowa and New Hampshire. The polls were done between December 27th and January 3rd in both states. They questioned 953 Democrats and Leaners in Iowa (with a 3.8 point margin of error) and 519 Democrats and Leaners in New Hampshire (with a 5.3 point margin of error).
They also predicted the number of delegates that would be awarded if the caucus and primary actually broke down according to the poll. If that happened, then the delegate count after these states voted would be -- Sanders 21, Biden 20, Warren 13, and Buttigieg 11.