Biden’s persistent campaign emphasizing moderation and a return to bipartisan collaboration is exactly what this country needs to recover from the damage inflicted by President Donald Trump. There’s a new air of confidence and optimism because, finally, the squabbling is dying down, and Democrats are closer to offering a single viable candidate — someone with executive-branch experience who even centrist Republicans can support if that’s what it takes to restore dignity and presidential aplomb in the Oval Office.