I am skeptical of this poll. No way Morrissey does better than Jenkins against Manchin.
Why not?
Well, Morrisey has already won two statewide races so I can see his name rec being higher in WV-01 and 02, but he is a worse fit, for reasons explained numerous times (such as his past in NJ, history as a lobbyist, and carpetbagging into the Eastern peninsula, which is WAY different from the rest of the state). In a general election, Jenkins can appeal to a lot of ex-D Trump voters, but, they won't be able to support him in the primary, as most remain registered Democrats.
I'd say, Morrisey should be doing about 2 points worse than Jenkins, but 10 points better than "Stupid Alex" Mooney.
It's also possible that Jenkins's base prefers Manchin to Jenkins, sort of in a way voting
Manchin > Jenkins > Generic R > Generic D