What is another word for "spokesman"?

Roget's Thesaurus (1911) lists these synonyms for "spokesman": annotator, cicerone, commentator, courier, demonstrator, dragoman, explainer, exponent, expositor, expounder, glossarist, interpreter, metaphrast, mouthpiece, oneirocritic, oracle, paraphrast, place, prolocutor, scholiast, showman, speaker, valet.