President Biden thought the late Rep. Jackie Walorski (R-Ind.) was alive Wednesday because she was “top of mind” for him as he prepares to meet her family Friday, White House press secretary Karine Jean-Pierre claimed to the incredulity of the press corps. The Biden administration’s regular briefing later devolved into chaos as reporters pressed Jean-Pierre to address the 79-year-old president’s mental health. Biden made the gaffe earlier Wednesday at a nutrition event in Washington, saying, “Jackie — are you here? Where’s Jackie?” despite the fact that he publicly mourned Walorski’s death in a car crash last month — and even...