Glenn Greenwald discusses the efforts to advertise the new Dixie Chicks movie:
NBC responded to a clearance report submitted by the Weinstein Company’s media agency saying that the network “cannot accept these spots as they are disparaging to President Bush.”
...
Leave to the side for the moment the fact that this controversy is far more likely to help the film than hurt it. Far more important than that issue is the emergence of a very disturbing trend whereby television networks are refusing to broadcast political advocacy material that will offend the Republican power structure in Washington.
Italics indicate material quoted in the original post.
The entire post is well worth reading.