 If he does not abjectly fail, as he did in a debate with former President Donald Trump two weeks ago, or as he did on his Friday night interview with George Stephanopoulos, or as he did in this week's call-in with MSNBC's Morning Joe, the president will buy a little more time for his besieged candidacy for re-election. Biden is on a pass-fail basis for every appearance going forward. If he does elicit more derision,