Is Karl Rove no longer in charge at the White House?

Because I'm watching Bush's news conference right now (we haven't gotten to the question-dodging part yet) and he's utterly incoherent, jumping from topic to topic.  More incoherent than usual, even.  (Hilarious technical problems aside, which I'm sure you'll see on tonight's Daily Show.)

WTF is going on?  Why did they call this surprise press conference with one hour's notice?  Usually they only do that when there's big news, and there doesn't seem to be anything compelling here.