According to Pew’s annual Public Evaluations of the News Media survey, the public’s perception of accuracy in news has reached a two-decade low. And the most dominant source of people’s local, national and international news is television.
From the Pew report:
Just 29 percent of Americans say that news organizations generally get the facts straight, while 63 percent say that news stories are often inaccurate. In the initial survey in this series about the news media’s performance in 1985, 55 percent said news stories were accurate while 34% said they were inaccurate.
And when it comes to where most readers get their coverage, it breaks down this way:

When it comes to partisan differences, Republicans had far less favorable ratings on all news outlets but Fox News and the Wall Street Journal. Overall, in addition to Fox News and the Wall Street Journal, Republicans had net-positive favorable views of CNN, Network TV and NPR. However, Democrats polled had much higher favorable ratings for these entities as well as MSNBC and the New York Times.
The poll was conducted of 1,506 adults, 18 years of age or older, from July 22-26, 2009, including 114 who had no landline telephone. For the full details of sampling and the margin of error see the Pew description of the polling.