NBC taking orders from Tony Snow?

Oh, look, the corporate media bows down to the White House:

NBC is refusing to air an ad for the new Dixie Chicks documentary, “Shut Up & Sing.” Variety reports, “NBC’s commercial clearance department said in writing that it ‘cannot accept these spots as they are disparaging to President Bush.’

Another example of the so-called liberal media in action for you! So does this mean that NBC will reject any mean-spirited ads from Republicans on the grounds that they are "disparaging to the Democrats"?

Of course not.