Joe Biden ran two presidential campaigns alongside Barack Obama and served as vice president for eight years, yet his decades-old position on federal busing never seemed to come up during that extensive time period. If it did, it was confined to niche left-wing media. Certainly the denizens of MSNBC or the blue-check Twitter spinmeisters seldom, if ever, evinced concern for that aspect of Biden’s record which they now claim to find so morally abominable.