 Olivia Nuzzi reports this was true back in 2020, quote, a campaign trail is a grueling exercise for anybody of any age, from the youngest network embeds to the oldest would-be president. And back then, there were days when Biden appeared sharper than on others. I knew it was a good day when he saw me and winked. On such occasions, he joked and prayed and cried with voters. He stayed to take a photo with every supporter. He might even entertain a question or two from the press. He had color in his face. There was no question he was alive and present. On bad days, which were unpredictable but reliably occurred during a challenging news cycle, he was less animated. He stared off. He did not make eye contact.