So, inside the debate section, we'll have two columns where people's responses will be displayed. The posts in both these columns will be pushed at the top depending upon the number of 'likes' they get. This could be real time to make it even better
The person typing a response will be able to select whether the post is 'for' or 'against' through a radio button.
Just an idea - I'm sure the design and coding experts here will be able to make a great add-on out of it (and offer it for free to me )