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By "public sphere" you mean the media. The media in this country are a disaster thanks largely to for profit, publicly traded news being the overwhelming source for most people. If it looks like liberals and conservatives don't interact to the rest of the world, it is wholly the result of the media concocting and exporting a story they find compelling. Politicians, most of whom are egomaniacs, love this narrative, because it give them them the feeling that they are like a sports team that gets to have a cheering section.