Clinton: Time away helped her ‘reconnect’ to run

Hillary Clinton is back on the campaign trail after a bout of pneumonia. On Wednesday, she released a letter from her doctor that said she is “fit to serve” as president. On Thursday, Donald Trump released his medical records from his longtime doctor, saying that he is healthy. Meanwhile, a new poll from CBS and The New York Times suggests that the race continues to tighten. Gwen Ifill reports.