With the emphasis on the presidential election, it seems that the candidates (mostly) speak to a focus-grouped constituency. So why not subvert the usual debate format and have moderators ask questions of selected voters? Each response to a prompt would be broadcast as-is, unfiltered through the lens of statistical analysis, thus providing a more vital documentation of the wishes of the electorate in a specific area of the country.
The problem is, by the time Indiana' March primary rolls around, it's rendered meaningless by earlier primaries and Super Tuesday. Perhaps a Voters' 'debate could focus as much on local issues as national/international issues. It could also spark more interest among the electorate for local politics by making participation in local politics a truly visceral experience.