Democracy Corps did a post-debate survey of Democratic voters and found that Biden’s net favorability with African-Americans went up by 18 points.
Read that again: Post-debate, Biden’s net favorability with African-Americans went up by 18 points.
This wasn’t just one poll: A Morning-Consult/538 poll showed that Biden’s total favorability changed barely at all from pre- to post-debate—going from 76.5 percent to 75.6 percent, a drop that’s essentially meaningless. And when voters in that survey were asked what they thought of the candidates’ debate performance, Biden was one of the four candidates in the second debate who got a thumbs up.
The other three candidates from the second debate who Democrats said did well? Kamala Harris, Bernie Sanders, and Pete Buttigieg. Which was exactly the read I had.