I am not sure that acting like Republicans is a good example of growing up. Neither is calculating probabilities based on multiple polls whining. The sense that many have that Biden is a weak campaigner is based on more than his first debate. And to say that he is a weak candidate is not to say that he is or would be a weak President. But then: the voters. I myself will vote for him, but given the State that I live in, my vote and the votes of my Democratic fellow travelers will count for nothing.