I was going by the assumption that nobody would voice that in the hope that the wolves wouldn't realise, morm.
However, if two people pretend to be the Seer, it's best not to lynch either. Instead, we deduce who the wolf is. In fact, the wolves should have a hard time pretending to be a Seer - if they lie about somebody's guilt, and that person is lynched, the wolf will be found. As soon as a false Seer starts lying, that's game over for them.
EDIT: Plan suspended. *wistful look*