I'd say add a field in your table for "type or response" or something like that, and then post the type of post, whether comment or actually debate. Then I would say use CSS and some DIV and SPAN tags to separate the two so you could have the comments off on the margin or to the side, or perhaps a DHTML/AJAX/Javascript popup.
There are many ways that you can approach this, but I think that you only need one table in your database.
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