A inaccurate term to describe the Corporate media which tends to have range of similar but different baises. Corporate News does have a unfair bias but it does not lean to the left.
They tend to endorse Corporate conservatism while leaning very little to the left on Social Issues. However when you look at News Talk shows on the Radio and TV the overwelming amount of host are Conservative or Moderate Conservative.

The Liberal News Media is generally used to cry conspiracy when article comes out that gives critical feed back on Conservative policies.
See Conspiracy Theory