Bias...

CNN has often been the subject of allegations of party bias. In research conducted by the Shorenstein Center on Media, Politics and Public Policy at Harvard University and the Project for Excellence in Journalism, the authors found disparate treatment by the three major cable networks of Republican and Democratic candidates during the earliest five months of presidential primaries in 2007: 

"The CNN programming studied tended to cast a negative light on Republican candidates – by a margin of three-to-one. Four-in-ten stories (41%) were clearly negative while just 14% were positive and 46% were neutral.

The network provided negative coverage of all three main candidates with McCain faring the worst (63% negative) and Romney faring a little better than the others only because a majority of his coverage was neutral. With the exception of Obama, 

Former Republican House Majority Leader Tom DeLay, and Media Research Center founder Brent Bozell, among others, have referred to CNN as the "Clinton News Network".^[2] DeLay has also called it the "Communist News Network".^[3] In its early days, CNN was sometimes referred to as "Chicken Noodle News".^[4] 

In September 2009, a Pew Research Poll showed that Democrats were much more likely than Republicans to rate the network favorably, and Republicans were much more likely than Democrats to see CNN unfavorably.^[5]