It's another symptom of poisoned politics here in the US. As far as I've seen, the people who are attacking Nate Silver are Republicans who simply don't like what Silver's stats are pointing to. They're the same people who claimed last month's unemployment figures were somehow manipulated because it showed a downward trend in unemployment.
It's also an insight into the state of journalism and the press in this country. It's pretty hard to find objective reporting these days, sources of 'news' seems to be full of highly opinionated punditry rather than unbiased reporting.