LAST DITCHAwww . . . . a heartwarming story. Poor homeless man drives all the way from Louisiana to Washington DC in his FEMA trailer to plead the needs of Katrina victims before President Bush. Even better: he’s a white guy named Rockey (not one of those angry blacks down there). Except, hmm . . it wasn’t a FEMA trailer. And he’s a former chief executive of a company, not just your average Joe