‘Stake,’ is Mormon jargon. I couldn’t find ‘stakeholder,’ but it’s easy to see how they could extrapolate it:
stake - A geographical-ecclesiastical unit of the Church, composed of several wards and sometimes branches.
stake center - A meetinghouse of the Church in which the administrative offices of stake leaders are also located.
stake president - The presiding authority of a stake.
http://www.lightplanet.com/mormons/daily/vocabulary_eom.htm
Thanks, FW! I was fairly sure it was a term for one of the rungs along their social leadership hierarchy.