All this horseshit about Judith Miller's principles (or lack thereof) is clouding the real issue: BushCo's horrific mismanagement of American national security. Karl Rove couldn't be happier.
Miller screwed up when she agreed to keep her source confidential in the first place. A real journalist would have realized the disgusting motivations of the leaker and told them to fuck off. This case is about personal integrity (i.e., Miller agreed to keep a source confidential and is keeping her word), not some great journalistic principle which doesn't even exist.
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Whistleblower laws already shield those who would speak truth to power from recrimination. Again, other than personal integrity, there is simply no good reason to grant the leaker in this case any kind of protection.
Judith Miller is simply picking up where she left off: A tool of the immoral BushCo. That's where we should be picking up too.