President assemble: Obama can reach parts of Democratic base Biden can't

Biden's charismatic former boss and rival appeared in a show of unity alongside Bill Clinton, who despite a problematic legacy still has a campaign role to play too For once showbusiness royalty - Queen Latifah, Lizzo, Ben Platt, Cynthia Erivo, Lea Michele and Mindy Kaling - was not the main attraction. Instead it was a trio of US presidents that enticed people to pay up to half a million dollars for New York's hottest ticket. Last month Joe Biden was joined onstage by Bill Clinton and Barack Ob...