I've often commented on the Leftist leanings of the mainstream media, and a recent Rasmussen Report survey seems to bear this out. The money quote:
"By a 39% to 20% margin, American adults believe that the three major broadcast networks deliver news with a bias in favor of liberals. A Rasmussen Reports national telephone survey found that just 25% believe that ABC, CBS, and NBC deliver the news without any bias."
Pretty damning stuff. And, it's not the first such report I remember reading about.