Karen Hughes is UnderSecretary for Public Deplomacy (R). In the State Department, there are undersecretaries for several things and they each have their own letter. Politics is P, Economics is E, Arms Control is T, Management is M, and so on. D is the number two person, just under S.
cheers,
Thanks!
I knew she was in charge of carrying the Secretary's brief case and hand bag, but I wasn't sure of her official position.