Now 108
/^\w\w\z/&("MNCAKSCOHINMOKTNVALARIDCTX SDE GAZ ORIL IAKY"=~/$_/|
/(FL|M[ADEIST]|N[DEHNJY]|PA|[UV]T|W[AIVY])/)
Another stoke off by adding a redundant check for Alaska, which allowed me to move Iowa and Kentucky out of the regexp and into the (more compact) string.
This suggests that there's a lesson in here about how a bit of redundancy in data can lead to more compact representations. I think we often hear problems like "match every state and nothing else" as "match every state exactly once, and nothing else."
