Well this is pretty bad:

As The Los Angeles Times showed yesterday, Libby's prison sentence was not "excessive" by legal standards, but such a statement by the president is sure to be embraced by defense lawyers all around the country (experts have already dubbed such an argument "The Libby Motion"). They're also sure to mention Bush's assertion that Libby's sentence as it stands after the commutation ($250,000 fine and two years probation) is "harsh." Meanwhile, the Times reports, "Federal prosecutors said Tuesday the action would make it harder for them to persuade judges to deliver appropriate sentences." This from an administration that's continually and inflexibly pushed for truly harsh penalties. The New York Sun reports that the first such invocation of Bush's order might come from an alleged Hamas operative convicted of obstruction charges.

I doubt the Bush Administration is concerned. The entire reason the Libby case came to be is because the Bush Administration puts political goals before national security.