As Hurricane Katrina approached, who in the Bush Administration knew what, and when did they know it?  Getting to the bottom of that question is a world-class exercise in frustration. Take today’s hearing of the Senate Homeland Security Committee: The Committee released documents showing that the White House situation room received a report at 1:47 a.m. the day Katrina hit, predicting that Katrina would likely lead to severe flooding and/or levee breaching.  A couple days later, the president said no one anticipated [...]