Biden seemed focused and really on top of foreign policy last night in his press conference. His decades of expertise showed, something we really needed to see right now. I didnt see any Parkinson hand tremors (it would help if they would provide him a glass of water at these appearances - being able to see him lift a glass would provide further confirmation). He also said he would accept having a neuro exam, if his team of doctors recommended it. A couple name flubs which, as Lime noted, would be typical of any Biden from the last couple-three decades.
I think the question remains more can he beat Trump, and media driven public perceptions, than can he be a statesman and craftsman of policy. FFS, just get the neuro test.