Bigger GOP pickup... increass chance that a reelected Manchin switches parties?
Can we compare him to Shelby & Campbell who switched as well?
I think if Manchin sees that the GOP is beyond the margin of neverTrumpers (Tom Collins, MurCowSki) he may switch . . . if he wins.
He would have far more clout in a GOP majority than as an outcast in a DemoKKKrat minority.