CHARLESTON, W.Va. -- A case that knocked a state Senate candidate off the West Virginia primary ballot has created legal precedent.A state Supreme Court opinion issued Thursday says residency requirements for Senate candidates don't violate the constitutional principle of one person, one vote.The unanimous decision follows up on the justices' February ruling that disqualified Frank Deem as a legislative candidate.Deem sought to challenge Sen. Donna Boley in the Republican primary. She petitioned the Supreme Court, citing the West Virginia Constitution. It says that senators in a multi-county district must live in different counties. Both Deem and Boley's district-mate, Sen. David Nohe, are from Wood County. Nohe had unseated Deem in the 2010 GOP primary.Thursday's opinion also upholds residency requirements in recent legislation that redrew the state's Senate districts.