Because Dubbya just found out that something really atrocious from the Clinton administration was not cleaned up, and it's too late to tell the populace about it, because of all the worry over Muslim terrorists.
It's not that Dubbya wants to cover it up; it's that the can or worms is too ugly to let us know.
Why are you covering up for W, because if Sore would have been incharge right now, you would have been crying Bloody Mary.
W should always remember a lie is a Lie, I don't care who it comes from.
If W and the NTSB cover this crash, it's time to tell the GOP to take a hike .