Conquest of the Horde

I was wondering if there were mediums (the spiritual type) in WoW?
What class would be appropriate?
Any ideas on how it could be RP'd? Indeed are there any members who are out there RPing mediums at the moment?

I could see a troll shaman or witch doctor communing with the dead.
Warlocks? Necromancers?
Any thoughts, suggestions or feedback would be appreciated.

Shamans communicate with the dead, that is one of their powers. They are able to speak with their ancestors and I have, once before, assisted someone with my Shaman to communicate with their dead friend (Whom was a wolf). In my personal opinion, to communicate with someone's spirit, you'd need something that was a part of them when they were alive be it a part of their body or an object close to them.

But, yes, it is completely possible and Shaman would be the class to take.

Shaman definately. Its loosely possible for a priest but nowhere near the level of a shaman.