Today it's very difficult to determine the real involvement of a member in a given community without analysing his profile activity and badges.
By involvement I don't mean performance (such as reputation, good answer/question badges, etc). Some users may be very active but do not have any major badges like Civic Duty, Electorate or Fanatic. However, their involvement is valuable and they deserve some distinction. They must be distinguished from occasional users.
I suggest a new silver badge that will tag a given user with a sort of citizenship to the community.
Citizen — Has posted at least a question, answer or comment with at least one upvote 20 times a month for the last 6 months.
That badge should be permanent. Real world example: my mother was born in Italy and immigrated to Belgium when she was 17 years old. She still can vote in Italy and also in Belgium where she has citizenship thanks to her involvement (not performance). She has both citizenships.
We may use that badge to determine who is able to vote in the future election.
That badge is easier to get than Fanatic, but harder than Commentator or even Yearling.