 Both President Biden and his rival Donald Trump were back on the campaign trail. The president worked to respond to post-debate worry after giving some rambling answers, as we heard, to those debate questions. CBS News correspondent Weijia Zhang was with Mr. Biden in Raleigh, North Carolina, and spoke with campaign officials and voters at the rally. He acknowledged his age, and he said that wasn't going to stand in the way of the job he knows he is meant to do. Take a listen.