Jill Biden Could Make or Break Biden’s Campaign. She Says She’s All In.

President Biden knew immediately after stepping off the stage in Atlanta on Thursday night that the debate had gone wrong. In those first stricken moments after a raspy, rambling and at times incoherent performance, he turned to his wife, Jill Biden.Whatever was going to happen next in Mr. Biden’s last presidential race, after perhaps the worst moment of his long political life, was always going to come down to her. His wife of 47 years had entered his life all those decades ago, reluctant to get into politics but fully embracing his dreams and his belief that he would one day reach the…