For nominees who are actively answering questions, is it acceptable for them to mention their nomination in comments when others express an appreciation for their efforts?
I think that it would hurt more than it would help. It's a bit tacky, and I wouldn't consider voting on someone who does that, if I knew nothing else about him. Others might react differently.
Besides, is it really such a big deal? Do you really want to have more responsibilities on the site and an obligation to be logged on as much as possible? Sure, we do it anyway, but as a hobby. If you win the election, great, if not, what did you lose?