I think this is follows Bush's rope-a-dope strategy, because it drags out and focuses the national discussion on the war on terror (instead of, for example, "the economy, stupid") and Bush has the aces in his hand to win that discussion.
Bush got the RATs to scream for the hearings, so he "gave in." He had the RATs screaming for Condi's testimony, so he "gave in." Now they are screaming for the PDB, and the WH has signalled it will "give in."
And yet, with each giving in, the facts become stronger in Bush's favor and Clinton's legacy is further trashed, and the RATs are shown to the public for the demagogues that they are.
I think Sun Tzu's Art of War says to "appear weak where you are strong and appear strong where you are weak." On the War on Terror, Bush is strong, but is currently appearing weak to lure the RATs in.