Plugin for Reddit-like AMA on WordPress?

Does anyone know of a plugin that will allow real-time (ajax) questions to be asked by visitors? I have been trying a lot of the Q&A plugins, but they are all either not the right fit or way to complicated for the visitor.

I’d like to be able to have a “guest” see the questions as they come in and answer the ones he/she would like to.

I thought there might be a simple mod to the comment system, but changing the language will change it for the entire site, not just the AMA section.

I would like it to have ajax functionality so both guest and visitor do not need to reload the page.

Am I just missing something easy?

Thanks.