 Quote, only 29% of Americans think Mr. Biden is mentally sharp, a figure that has declined steadily over the three and a half years of his presidency. She writes, both Mr. Biden and Mr. Trump have had questions raised about their fitness for office. Mr. Trump can do himself a large favor by avoiding raising further questions about his own stamina and focus. He must display the qualities that he claims Mr. Biden does not possess, lucidity, energy, and coherence. Kristen Soltis Anderson in today's New York Times.