Indeed, Sanders outperforms his rivals among self-described progressive voters, who make up 54 percent of the Democratic electorate.

He gets support from 36 percent of these progressives, versus 20 percent for Warren and 12 percent for Buttigieg.

Among more moderate Democratic primary voters (42 percent of the electorate), Biden gets 26 percent to Buttigieg’s 24 percent.

By age, Sanders laps the field with voters under 45 (getting 39 percent support), while Biden and Buttigieg are essentially tied among those 45 and older (19 percent and 18 percent, respectively).