From AOHell's Welcome Screen:
The media want to return to their script of "Bush the Popular" so bad that they can TASTE it. That's what the story is SUPPOSED to be, but they can't recite it, and it's driving them crazy. So they get all excited and start breathing hard every time that dead cat bounces.
As atrios has pointed out, they keep reporting that Bush's approval is climbing, but it never seems to actually go anywhere. That's because they ONLY report the temporary bounces, but become mute bobbleheads when the poll numbers sink right back to where they were.