That doesn't mean shit. I am a registered Republican in Texas. I vote in every primary, desperately trying to get a more reasonable candidate on the ballot (it hasn't worked yet). Come general election day, I vote straight D. For the races I don't know, I use the Austin Chronicle's endorsement list.
This always seems self defeating to me. At least register as Independent so you can vote in primaries for the secret Democrats also trying to play this game.