Actually, that candidate I mentioned did use Podcast..but you can not follow Podcast like Twitter and you can not find podcast files by searching with names of politicians pronounced in those files. Under the law, during the campaign period, names of their podcast files should not identify their names or policies, because names (or desciption) of such files will likely to be considered as distribution of documents.
That old law is just prohibiting distribution of documents and figures, and actually some candidates just put audio files on their web and did not get arrested. So, if you want to make some yen, you can launch strictly-sound-only-twitter service.