Mooney, one of the most conservative members of the state Senate during his 12 years there, beat Democrat Nick Casey by a 47-44 percent margin. Despite charges that he was a "carpetbagger" in his new home, Mooney seized the seat previously held by Republican Rep. Shelley Moore Capito, who won a U.S. Senate seat.
The victory will reunite Mooney with his ideological soulmate, Maryland U.S. Rep Andy Harris, who won the state's First District seat in 2010. The two men entered the Maryland Senate in 1998 as conservative insurgents who knocked off longtime moderate Republicans in that year's primary.
Mooney, 43, lost narrowly to Democrat Ron Young — who was re-elected Tuesday — in 2010. After his loss, Mooney served as chairman of the Maryland Republican Party and considered a run for Congress in Maryland in 2012 before deciding to move to West Virginia.