 Possible Trump VP pick Ohio Senator J.D. Vance called it a massive win. A new CBS News YouGov poll conducted following the CNN debate last week has found that 72 percent of registered voters now do not believe that Biden has the mental and cognitive health to serve as president. That number is up from 65 percent in early June. Meanwhile, First Lady Jill Biden telling Vogue magazine they will not let 90 minutes define the four years Biden has been president.