The jocular word mugwump, noted as early as 1832, is from Algonquian (Natick) mugquomp, "important person, kingpin" (from mugumquomp, "war leader")[1] implying that they were "sanctimonious" or "holier-than-thou,"[2] in holding themselves aloof from party politics.


via Wikipedia's take.

Will peruse the play anon, when I can stand one-More 'symptom' of..