 I'm Michael Toscano. Democrats are dealing with the aftermath of President Biden's performance in the Thursday night debate amid calls for him to step out of the race. CBS's Robert Costa has been hearing from them. I've been talking to people close to the president, and they say this is someone who has been on the public stage for more than a half century, elected to the Senate in 1972 in the wake of a personal tragedy. He has been through that and political humiliations over the years. He keeps going.