This argument seems pretty compelling. He's the only person whos claimed doctor, and it seems to reasonable to assume that the remaining Cyon is a doctor, considering that there's been two Cylon watchers. And if Tigh were a human doctor, why didn't the mafia target him last night? It's a risk lynching him, as he's the only confirmed Doctor - if he is town, we'll be shooting ourselves in the foot, and as anyone who's watched the show knows, I hates losing a leg -, but to me there aren't any other clear mafia candidates right now.
##Vote: Tigh