Joe Biden has framed a nail-bitingly close race for governor of Virginia as a referendum on his young presidency and an opportunity to rebuke his predecessor, Donald Trump. Seemingly liberated from the formal trappings of office by a return to the campaign trail, Biden used a rally in Arlington, Virginia, to launch an unusually scathing and sustained attack on the former president. Biden had made the short journey from Washington to speak in support of the Democrat Terry McAuliffe, who faces a tight election against the Republican Glenn Youngkin next week. “Just remember this: I ran against Donald Trump,” he...