Is Joe Biden cancelled yet?

Seems like it's all happening so fast.

In the latest poll, Biden's support among black Democratic voters shrunk to 31 percent from 48 percent in the June poll. Harris, on the other hand, saw her support among black Democratic voters grow to 27 percent, from 11 percent in the June poll. The June poll numbers on African American voters were provided to NBC by Quinnipiac.

What even is Joe Biden's constituency?  Right now it's just a bunch of Democratic Party functionaries waiting for the signal that it's okay to go support somebody else.