05:06Newsday18/08/2020 04:06 GMT: Top Democrats make opening pitch for Joe BidenBBC World Service Duration: 53 minutes Tue 18th Aug 2020, 05:06 on BBC World ServiceAvailable for over a yearListen nowLive news, business and sport from around the world. Show more GenresNewsFormatsMagazines & ReviewsBrandNewsday Source: BBC Online