I'm not aguing that Fox News isn't biased.

In fact, I think Fox News sets out to be biased presenting news and editorials obvious flying the neo-cons flag.

As to how or why the various media outlets tend to vcover the same stories?

That's fairly easy to explain...those stories are unquestionably importatnt issues of the moment, or they have the sex appeal that they know sells soap.

NPR is about the only outlet that often runs stories that aren't covered by the commercial outlets, or more importantly, doesn't cover stories which have only sex appeal but no real relevance to the audience, otherwise.

Not that I think for a moment that NPR doesn't come at the news with their own obvious bias.

In fact the above, proves their bias is different that most of the other media outlets.