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Most people don't think of it as a podcast but my most regular jogging download are the bloggingheads.tv dialogues. They're meant to be watched, but they supply the dialogues in mp3 format as well. They post about 1-2 a day, and most are about politics but some are about science as well. The level of discourse is uneven, but closer to think tank than CNN, while partaking of both styles.
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