A new Fox News Poll finds Biden continues to lead the nomination race with the support of 31 percent of Democratic primary voters. Next is Elizabeth Warren at 20 percent, Bernie Sanders at 10 percent, and Kamala Harris at 8 percent.

Warren’s move up came in steady steps. From March to May she gained 5 points, then 3 more in July, and 8 more in August — for a total 16 percentage-point increase.

During that same time, Sanders dropped 13 points (from 23 percent in March to 10 percent now).

Biden and Harris are both exactly where they were in March.