 I'm Sherry Preston. One man seemed to have trouble telling the truth. The other seemed to have trouble staying on track. Some takeaways from last night's presidential debate in Atlanta. ABC News Chief White House Correspondent Mary Bruce talking about the number of times President Biden stumbled, stared and appeared to lose his train of thought. This goes beyond just a rocky performance. As we've been saying, the president had to convince voters and Democrats that he can do this and he can win. And instead, he may have done the opposite, validating voters' trepidation about his age.