A 2003 study by the Pew Research Center for the People and the Press found that “Most Americans (53%) believe that news organizations are politically biased, while just 29% say they are careful to remove bias from their reports ... More than half—51%—say that the bias is ‘liberal,’ while 26% discerned a ‘conservative’ leaning. Fourteen percent felt neither phrase applied” (Harper, 2003). Now add to this that even some academicians are finally accepting the idea that journalists, as a group, are more liberal than the population as a whole. However, whether political or other biases (Hahn, 1998) affect news coverage is still argued. We believe political biases do affect news coverage, in that reporters and editors select and frame news stories in a way that reflects their predispositions.
Cooper, S. D., & Kuypers, J. A. (2004). Embedded versus behind-the-lines reporting on the 2003 Iraq war. In R. D. Berenger (Ed.), Global Media Go to War (pp. 161-172). Spokane, WA: Marquette Books.