A study by the conservative Media Research Center shows that since the Sandy Hook shootings, evening newscasts on CBS, ABC and NBC, along with their respective morning news programs, aired far more stories sympathetic to gun control rather than stories sympathetic to gun rights.
For every story sympathetic to gun rights, there were eight sympathetic to gun control, according to the study. It found that CBS's Evening News was "most biased in favor of gun control," followed by ABC's World News and then NBC's Nightly News.
To assess whether a story was pro-gun rights or pro-gun control, MRC looked at the statements made by reporters and the interview subjects...: "Among statements recorded as anti-gun rights: violent crime occurs because of availability of guns, not criminals; and gun control prevents crime. Categorized as arguments for gun rights: gun control would not reduce crime; that criminals, not guns are the problem; examples of citizens advocating or exercising their 2nd Amendment right to self-defense. Using this story-angle method demonstrated that even in pieces where the talking head count is balanced, reporters’ statements can often end up tilting the angle of the entire story."