These people are here to help take out Cain. Talking to them won't do any good. They're here to push the negatives, and they're just using FReeper posts to do it. Any post will do. They just pick one.
Alinski rule #11 - If you push a negative hard and deep enough it will break through into it's counter side. They believe, and for some FReepers it will work, the constant repetition of a lie will eventually make it the truth, or at least enough of a truth to manipulate those who are listening.
Shun them.
As with the affect the charges have had on the general voting public, their charges here will work against them as well. The only ones who may buy into it are those already holding biases against Cain; mostly because they already support another candidate.
All these people are doing is establishing their acceptance of Romney as the “chosen” candidate. We know who to blame...