 He acknowledged Biden's weak debate performance, but reaffirmed his support for the president. I've worked with Joe Biden. I've been on the phone with him, but I've been in the room with him. This is one of the most effective presidents that I've ever served under. But he says that the president needs to demonstrate his competency to voters. I think the president needs to engage in the kind of interaction with voters that will prove to those that are skeptical out there that he can do the job.