Joe Biden leads the Democratic presidential primary but a tight race for second place has formed behind him as Sen. Elizabeth Warren leads Sen. Bernie Sanders by one point, according to a new CNN poll conducted by SSRS.

The former vice president is at 24%, Warren at 18% and Sanders at 17% are once again the only candidates to reach double-digit support. Three other candidates have 5% or support or more in the poll: Sen. Kamala Harris (8%), South Bend, Indiana, Mayor Pete Buttigieg (6%) and former Rep. Beto O’Rourke (5%). The remaining candidates all score 2% or less in the poll.