Check out this excerpt from the Media Research Center report on the coverage of the Abu Ghraib abuse story:
To illustrate a fraction of the bias problem, we counted the number of prisoner-abuse stories on NBC’s evening and morning news programs (NBC Nightly News and Today) from April 29, when the story emerged, through May 11. There were 58 morning and evening stories. Using the Nexis news-data retrieval system, we counted the number of stories on mass graves found in Iraq from the reign of Saddam Hussein in 2003 and 2004. The number of evening and morning news stories on those grim discoveries? Five.