I watched Tony Snow during his WH press briefing and although he might be merely tired, he seemed worried about something. I watch him frequently and he's very good at maintaining eye contact and he didn't do that today.
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Very interesting. I wonder if they're sensing that this may erupt into a larger war or that a new terror threat has been discovered here in the US.
He could be merely tired, so I don't want to read too much into it, but I didn't read him that way. They must get so much intel that gives them sleepless nights and then nothing comes of it, thankfully.