President Joe 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 Joe 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 White House.

Now, her 81-year-old husband looked at her after a disastrous 90 minutes onstage.

The First Lady’s message to him was clear: They’d been counted out before, she was all in, and he — they — would stay in the race. Her thinking, according to people close to her, was that it was a bad night. And bad nights end.

“To say they’ve been in foxholes together doesn’t even begin to explain their bond,” said Elizabeth Alexander, the First Lady’s communications director.

So Jill Biden spent the 24 hours after the debate putting her decades as a political spouse to the test, projecting confidence and normalcy while effusively praising her husband. But, like the President, she is an intuitive political messenger who can sense the mood of a crowd. She knows that along with the cheering supporters, there are legions of people suddenly accusing her of forcing an old man to put one weary foot in front of the other.

If Joe Biden were to seriously consider departing the race, allowing a younger candidate to replace him, the First Lady would be the most important figure in reaching that decision. “Jill is the final and most important voice. She knows him and loves him with a passion. She also knows everything about him. Most big decisions are made with Valerie and Jill in the end,” said John Morgan, one of Joe Biden’s top donors.

New York Times News Service