Much of any political, or meaningful debate uses the human voice. Not only for convenience, but also as a means of expressing the full range of human expressivity, audio can and should form an essential part of a liquid democratic debate.
Podcasts are a good starting point. many of them remain open to interlinking, and the quality of the production and debate within this relatively new format is some of the highest on the web.
Furthermore the use of audio can add a Documentary element to the discussion. This is much more that Vox Pop, a documentary is a mediated process which seeks to provide an authentic voice to a particular domain. It has method.