text:  From ABC News, I'm Michelle Franzen. Following last night's debate between President Biden and Donald Trump, growing concerns about the president's performance when he appeared to stumble at times while trying to answer questions. President Biden also had a raspy voice. His campaign chalked it up to a cold. Today, President Biden in Raleigh, North Carolina, at a rally, his supporters cheering him on. He addressed the struggles last night and concerns about his age. The president says he's still the candidate best for the job.