A year ago, who would have thought 78-year-old Joe Biden would be sworn in this week as president?
He had just finished fourth in the Iowa caucuses. He would soon finish fifth in the New Hampshire primary. He was derided as old, out-of-touch, an elderly, silvery centrist who said screwball things, as when he told a crowd, "Folks, I can tell you I've known eight presidents, three of them intimately."