Santorum's campaign messed up badly when it came time to register and set things up at the election board in West Virginia.
Santorum could sweep the state by a massive margin (which is unlikely given the state may be mostly rural, but candidates with money who spend on ads can win there) and even if he sweeps the state massively he at most can get five of the delegates.
Chances are because of the ballot screw up Santorum does not campaign there, Romney comes by once or twice and spends some money for ads in the three large urban areas of the state and wins in WV.