He and his co-author Alex Thompson spoke at 9:30 Club to a crowd eager to revisit the past. “You guys want me to sing, right?” quipped CNN’s Jake Tapper, as he and his co-author Alex Thompson, of Axios, settled into their seats onstage.

A book the CNN host co-wrote has received positive reviews and appears to be a sales hit. But it has also generated intense scrutiny of him and his work.

Joe Biden has been saying stupid things for decades. What happened the night of the debate was not an anomaly. If there are two Joe Bidens, there's the one that you saw that you just described, and then there's the one who's non-functioning like what we saw at the debate night.