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...if Comcast were participating in a free market for broadcast and cable services.
They aren't.
They're just a bunch of rentseeking commie douchebags, who spend their time lobbying local communities for exclusive service provider contracts. Anyone who believes in capitalism should have contempt for a bunch of parasites like Comcast.
Luckily, the fact that they have chosen to be parasites creates a way to strike back against them: organize a campaign to contest the renewal of all of Comcast's cable licensing agreements at the local level. They often have had to license these things from individual counties and towns. I'm sure you could do serious damage to their renewal case in areas that are particularly anti-Bush. Comcast is the provider in most of Vermont, for example, and I'll bet Vermont is just full of people who would love to screw Comcast if something like this was made generally known.