Nixon: True, they do have the right to broadcast what they feel, but as Woody1968 said, it doesn't always make it the right thing to do.
The problem is that ClearChannel has been saying they yanked the show because of its "offensiveness". Well, the level of offensiveness hadn't changed one iota prior to the cancellation, except that it was now directed toward Bush, vice away from Bush. So, it's obvious that it really wasn't the "offensiveness" that they objected to and acted against.