Poll: Warren 28, Sanders 21, Biden 18

In the most recent George Washington University Politics Poll, the senator from Massachusetts leads the Democratic field with 28 percent of the vote. Sanders is second at 21 percent, and Biden, the front-runner since his entrance into the race, is at 18 percent. South Bend, Ind., Mayor Pete Buttigieg and Sen. Kamala D. Harris each draw 5 percent.

Although it’s just one survey, the findings suggest that Warren’s growing popularity, evident in other polls, comes from her increasing appeal beyond the party’s left wing. And with Warren also establishing herself as the second choice for many Democrats currently backing other candidates, she may be well-positioned to pick up more support as the field thins.