Joe Biden offered himself to Americans as a president they wouldn’t have to think about after the tumult of his predecessor. The surprise revelations that on three different occasions Biden’s lawyers found improperly stored classified documents and official records evoked the turmoil surrounding Donald Trump’s presidency, a four-year ruckus from which Biden has tried to move the country past. It’s an embarrassment to Biden, and the selection of a special counsel to investigate potential criminal wrongdoing in the matter exposes the president to a new, self-inflicted risk.