Former Vice President Joe Biden’s lead in the race for the Democratic nomination for president has rebounded, and now stands at its widest margin since April, according to a new CNN poll conducted by SSRS.

Biden has the support of 34% of Democratic and Democratic-leaning registered voters, his best showing in CNN polling since just after his campaign’s formal launch on April 25.

Sens. Elizabeth Warren of Massachusetts and Bernie Sanders of Vermont are about even for second, with 19% and 16%, respectively. Behind them, South Bend, Indiana, Mayor Pete Buttigieg and Sen. Kamala Harris of California each have 6% support, with Sen. Amy Klobuchar of Minnesota and former Texas Congressman Beto O’Rourke each at 3%.