Bernie Sanders and Joe Biden had the most contentious debate of their primary battle in front of just three CNN moderators on Sunday night as Americans practicing social distancing tuned in from their living rooms. And it was a strange one. Because of the COVID-19 pandemic, their first head-to-head showdown proceeded with no audience, the two men in their 70s walked on stage and elbow bumped, before then taking to their podiums, which were six feet apart, to commence a night of debating each other from across the stage.