 When he walked off Air Force One last night in Delaware, he responded to the reporter shouting questions that he was doing well. But at least for a few days at this key moment in the campaign, with questions swirling about the viability of his candidacy, Biden is going to be largely invisible, isolating at his beach house. Meanwhile, Republicans are putting on this big show of unity here in Milwaukee. That is NPR's Tamara Keith. Tam, thank you. You're welcome.