Literally any Democrat would crack 20% at least. It's not DC for Christ's sake; there is still a substantial ancestral Democratic population there that will NEVER vote Republican. Not enough to win a presidential race, but more than enough to keep a Democratic senator in power who was (mostly) running against the record of a historically popular Republican president there when combined with "swing voters."
Honestly, this question is just plain stupid. Even if Kamala is the absolute worst fit the Democrats could run for West Virginia, she would still easily surpass 20%.
You realize Hillary, who notably was not black, only got 26% of the vote, right? And more and more of those "ancestral Democrats" switch sides every day, both literally and figuratively.
WV doesn't care about race