When does the promotional tour for a book turn into a potential public-relations headache? That's the question raised by the blowback to "Original Sin," the behind-the-scenes look at Joe Biden's age-related infirmities,

CNN anchor Jake Tapper said on a Wednesday podcast that former President Joe Biden’s aides told him they found it difficult to determine whether his mental acuity was worsening due to his long history of appearing cognitively weak.