A VISIBLY CONFUSED JOE BIDEN SLIPPED HIS HANDLER'S LEASH AND TOLD THE WHITE HOUSE PRESS CORPS; THAT THEY NEEDED TO LEAVE BECAUSE HE WAS HEAVING "A MAJOR PRESS CONFERENCE TODAY."; IN FACT HE WAS SCHEDULED TO BE GETTING REHEARSED SOFTBALL 'QUESTIONS' AT AN MSNBC STUDIO INSTEAD . . . WHICH HAD NOTHING WHATSOEVER TO DO WITH THE PRESS CORPS OR THEIR PLACE OF ASSEMBLY.