New poll numbers show a tightening presidential race

Nationally, the race between Donald Trump and Hillary Clinton is getting closer; an average of polls show Clinton's post-convention bounce is over. Lisa Desjardins examines both candidates' polling strengths and Carroll Doherty of the Pew Research Center and The Washington Post’s Dan Balz join Judy Woodruff for a breakdown of the electorate and how the candidates can drive home their messages.