WHEELING, W.Va.—Democrat Joe Manchin has served the Mountain State for decades, as secretary of state, then governor, then senator.
But the state’s hard-right turn and the emergence of formidable GOP challengers have thrown his political future into jeopardy, with some voters questioning whether he deserves another term.
Mr. Manchin hasn’t said whether he plans to run for re-election.
The state’s current GOP governor, Jim Justice, jumped into the race on Thursday, a crucial recruit for Senate Republican leaders.
Another Republican, Rep. Alex Mooney , has also entered the field with the backing of some prominent conservatives, setting up what is expected to be a hard-fought primary.