text:  I'm curious, Evan Osnos, just what you are seeing as someone who has sat down one-on-one with Biden. I was going back and looking at what you wrote after you interviewed him in January. And of that interview, you said his mind seemed unchanged. He never bungled a name or a date. From what you can glimpse, is the Biden you sat down with six months ago, six, seven months ago, a different Biden from the one we just saw on that debate stage?