According to a study by the Program on International Policy Attitudes and Knowledge Networks, only 20% of the viewers of Fox News Channel are in touch with reality. In fact, none of the commercial TV news outlets can claim that over half of their audience knows the truth: CBS rates 30%, ABC 39%, and NBC and CNN are tied at 45%. Print media works out to 53%, and people who tune in to NPR and PBS rate at 77%.
Okay, it's wrong to say that these people are totally in touch with reality, but they did manage to correctly determine three things:
Anyway, there's more info in this poorly HTML-ized press release. Here's a nicer table of the data from that page:
| Network | No Misperceptions | One or More |
| Fox | 20% | 80% |
| CBS | 30% | 70% |
| ABC | 39% | 61% |
| NBC | 45% | 55% |
| CNN | 45% | 55% |
| 53% | 47% | |
| NPR/PBS | 77% | 23% |