Elizabeth Warren and Bernie Sanders battle for command of the spotlight

Leading liberals in the 2020 presidential race will command the spotlight in Tuesday's Democratic debate, and sparks could fly as Elizabeth Warren and Bernie Sanders battle over who will be torchbearer for the party's progressive wing. The two feisty US senators, personal friends who advocate similar left-leaning agendas but employ different styles, will be the top-ranked candidates on stage for the first evening of a two-night debate featuring 20 Democrats.