we had a go at this during the wikidatacon 2017 in Berlin.
my take away from this session is that there is indeed an emerging pattern for representing data related to political events, organizations, individual and themes on wikidata but that at the of the day you will have to make your decision to accommodate localized idiosyncrasies in the data.
you can take look at the documentation here:
Well structured political data for the whole world - impossible Utopia or Wikidata at its best by Lucy Chambers
and the Politics Track:
Wikidata and Open Government (Meta)Data - A missing link?
Well structured political data for the whole world: impossible utopia, or Wikidata at its best?
Politics Meetup
Marco