 totter out the back while his aides close these giant wooden doors behind him without taking any questions. If the question about Joe Biden is, does he have the stamina and mental capacity to be president of the United States, a four-minute demagogic speech in which he barely appears to be being held up by strings like a marionette. Jill Biden apparently is above him with the actual marionette strings. Sorry, Dr. Jill Biden. She's a doctor. Dr. Lady Macbeth Jill Biden.