More than five years after the fact, former President George W. Bush is admitting that having a photograph taken of him peering out the window of Air Force One at the Katrina-caused wreckage of New Orleans was a "huge mistake."During an interview with NBC's Matt Lauer set to air next week, Bush had no qualms accepting that, with 20/20 hindsight, he would have approached the situation much differently to avoid appearing "detached and uncaring.""It's always my fault.