A year ago at this time, Eugene Robinson embarrassed himself. Pushing back at suggestions that Biden was badly showing his age, we caught the Washington Post columnist and MSNBC analyst claiming that Biden is not merely sharp, but "sharp as a tack."But the truth has finally caught up with Robinson. Biden's disastrous debate performance left him and other members of the liberal media with no place to hide. And so, on today's Morning Joe, Robinson sang a very different tune: "I have been coming on this show for a long time. I am a long-time critic of Democratic bedwetting. I...