Louisiana Gov. Kathleen Blanco has joined the growing chorus calling for an independent commission to investigate the government handling of Hurricane Katrina. In a letter sent to President Bush on Wednesday, Blanco wrote, : “This disaster was of such a magnitude that it will certainly have significant national implications regarding the response to future events such as a natural disaster or a potential terrorist attack.” Continuing, Blanco wrote, “For these reasons, it is imperative that the investigation into the response to Katrina be comprehensive, probing and non-partisan.” Bush has appointed a top aide to head up an internal White House investigation into how the federal government responded to the crisis.