Anything likely to increase the number of votes per user seems like a good idea to me. I might be wrong, but I have the feeling that the more people vote, the more meaningful the overall scores are. Not in the sense that they would suddenly become 100% fair and accurate. But they would be closer to a representation of the majority's opinion. Which is the main meaning I attribute to them. Except for the cases when I post a silly answer and get the deserved downvotes which I then take as a wake-up call.
I would propose a gold "democracy" badge. And I would also impose a maximum ratio of downvotes, say $25\%$. Even if I'm not sure how to justify this.