mugwump (n.)

a jocular word for "great man, boss, important person," 1832, American English (originally New England), from Algonquian (Natick) mugquomp "important person" (derived from mugumquomp "war leader"). By 1840 it was in satirical use as "one who thinks himself important." It was revived from 1884 in reference to Republicans who refused to support James G. Blaine's presidential candidacy, originally as a term of abuse but the independents embraced it. Hence "one who holds himself aloof from party politics."