President Biden held a critical news conference at NATO’s Washington summit on Thursday evening as the fate of his reelection campaign hangs in the balance. The event came exactly two weeks after the disastrous debate performance in Atlanta that sent Democrats into a frenzy of panic and prompted a number of lawmakers to urge the president to stand aside. It’s a crisis that Biden has not yet weathered. The news conference was an hour-long walk on a high wire. Advisers hoped Biden would...