I’m sure he’s hurting.
The erosion for Biden was high as well. However, neither of the primaries actually mattered and there was no need for voters to turn out.
In the grand scheme of things, you’re correct as far as choosing the ultimate candidates. The question is are there as vites for someone else hard votes that won’t vote for the parties candidate or something else. The only state where it matters yesterday is Wisconsin since it’s battle ground.