I feel that giving people a closed forum section where people can talk and discuss the manga polls would be a great improvement to the culture of this site. The forum section should probably be closed from users posting new topics, but include a topic for each poll so users can discuss their answers or their reasoning for their answers.
A small link at the bottom of the poll would be good to pull more users into the forum.

You can already comment on each individual site poll though. Each one has its own news post

A just ruler amongst tyrants