Snollygoster: an unprincipled, but shrewd person. The origin of this word is unknown, but it was used to refer to dirty politics in 19th century America. One newspaper editor referred to a snollygoster as “a fellow who wants office regardless of party, platform or principle.”
Richard has not yet played a politician, honest or otherwise, but I do think this word could apply to our smooth criminal, John Mulligan. Definitely intelligent and definitely possessing fluid morals.