“Because of the controls for partisanship, we know these results are not just driven by Republicans or other groups being more likely to watch Fox News,” said Dan Cassino, a professor of political science at Fairleigh Dickinson and an analyst for the PublicMind Poll. “Rather, the results show us that there is something about watching Fox News that leads people to do worse on these questions than those who don’t watch any news at all.”
I’m pretty sure it’s the fact that News Corp is, in a fact, an international criminal enterprise. That tends to explain why folks exposed to their style of “news” tend to know less than those who aren’t exposed to anything.
It’s actually quite difficult to be “worse than nothing” in many areas, that Fox News Channel is worse than nothing when it comes to news, should be all anyone needs to know about them.