The line at the Post Office was of a December length, too long really to wait for such a simple errand. But there he was. When he got to the window he asked for a sheet of Christmas stamps. The clerk proffered a brightly colored set showing lots of candles and emblazoned with the word "Kwanzaa." "No," he said, "I'd like some Christmas stamps." The clerk did a sort of ‘oh-h-h yeah' thing and rummaged around in the suppl…