Mugwump?

[Jim Ferer <jferer@yahoo.com>]

No: HPFGUIDX 49550

Danger Mouse:"In 1884, the Republican presidential candidate James
Blaine was linked to a corrupt deal. Some Republicans ditched their
party for the Democrats because they were so put off by Blaine's lack
of honesty. Anyways, those Republican/Democrat converts were called
"Mugwumps," meaning "Holier-Than-Thou." Odd how Dumbledore, in SS is
credited with being the Supreme Mugwump..."

I looked this up in the Encarta disctionary, and it says "independent
person: somebody who takes an independent or neutral stance,
especially in politics....From Massachusett mugquomp ?war leader.?]

So your example fits, althought the definition doesn't agree with the
Holier-than-Thou sense.  Personally, I like the 'war leader' concept
in the origin of the word.