For the second time in as many presidential elections, Joseph Biden got to debate a young, attractive Republican candidate who was demonstrably less qualified to to be president than I am to be chairman of the World Bank. Joseph Biden is a very lucky man. The Great Political Matchmaker in the Sky keeps handing him people who are trying — and failing — to fight above their weight class, and he keeps blowing through what can now legitimately be called the Bum of the Quadrennium Club.