For instance, with the Rice testimony, it has been built up in the press to such a frenzy due to the cluck-clucking over whether she would appear that when she actually does appear, it will get huge attention, more than if she just meekly appeared at the committee's order, and way more than if she appeared publicly BEFORE the partisan Clarke. The administration ultimately gets a boost by drawing this out, something the liberals, looking at the short-term and not the long-term, haven't comprehended.
So, while the liberals grasp at straws, the President is showing his usual cunning. The beauty is that the liberals apparently don't even realize that what is happening to them is totally deliberate and succeeding.