Please read the paragraph on Judith Miller. You must be kidding.
If the best example of US Government censorship is Judith Miller, then my point remains very strong. No one in the US is stopping freedom of speech. At best, you can get arrested for failing to uphold a subpoena, which is a known fact anyway.
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Furthermore, despite the whole affair, not a single report of Spooks coming in to destroy computers, or otherwise try and stop the publication of those events. (As has been seen in the UK right now, with the whole Guardian thing going on).