That's a good idea and I'd like to see that happening. At the moment it's possible to the extent that people make it happen on Yoomoot. People can ask about whatever they want, so they can ask about the issues being discussed by politicians and the media. People can categorizes moots as 'uk' or 'usa' or 'vermont' etc, so they can signal that a debate is specific to a particular area. People from, say, Vermont can add politics+vermont as a favourite category, so they can focus purely on local issues and ignore the rest of the site.
I very much see this as part of Yoomoot's long-term evolution though. It's way too small to make the most of these ideas for now, or to take them further.