jmLÆWas thinking of "on chain voting" and I think "holders" doesn't want to use their key each time they want to vote. Even on vote.bitcoin.com you have to do so (you need to sign with your private key)
https://whatsonchain.com/tx/baf880d5f207b0b381bd42020ad4a621e57dfd800035e796fd5dcd890d5e646a