I have a different comment where I'm stating that one way to counter the influencing of votes is through allowing the voter to cast their ballot any number of times until it ends.

I can think of a method that allows a voter to decrypt the ballot payload only coupled with one or more keys from the parties that organized it. Ie, if I as an individual want to see the vote, I can't. But if I suspect my vote has been tampered with I can ask the organizers to audit it, and with both our keys, I can see the payload. (This is just back of the napkin theorizing, it might have other issues)