That wouldn't be a wise move. He narrowly won reelection to the Senate, and I don't think he would win another statewide race after 2018. He should focus on serving out the remainder of his term. Democrats can't afford to lose his seat.
If he runs and loses, he still holds his seat. If he runs and wins, a special election is held in 2022.
Which Democrats would lose in a landslide, thus costing them that Senate seat two years earlier.
If Trump is President, Democrats *might* be able to win it. But yeah, even if Bernie is President it's probably toast.
Why are you saying 'even' Bernie as if he's somehow super popular in WV?