Joe Manchins West Virginia Statewide Electoral History
2000 WV Secretary of State: 89 % (Did not have Republican Opponent)
2004 WV Governor: 63 %
2008 WV Governor: 69 %
2010 WV Senate Special (to fill Robert C. Byrds Term): 53 %
2012 WV Senate: 60 %
2018 WV Senate: 49 % (in a D+8 Wave Year) Manchin won by only 19,000+ Votes.
Not a favorable trend especially if its presidential year with the GOP probably winning by 25 points in the state.
Funny enough, Manchin has always performed best during presidential years.