BUSH'S BRAIN IN PAIN

There could be a simple explanation for Bush's poor recent performance:

Washington insiders have been buzzing that President Bush's guru-in-chief - often called "Bush's Brain" - has been suffering from the painful urinary-tract malady for the past couple of weeks, causing him to miss some key Katrina strategy sessions.

I'm told that the 54-year-old deputy White House chief of staff - who apparently was feeling well enough yesterday to travel outside the nation's capital - visited the hospital, possibly twice, to relieve his agony since Labor Day.

Kidney stones.