Arguably, the biggest takeaway from the Democratic debate on Tuesday was that CBS News didn’t know how to moderate. CBS Evening News anchor Norah O’Donnell and This Morning co-host Gayle King had almost no control as the debate would often descend into a cacophony of shrieking candidates. Their incompetence was so blatant that the panel on CNN’s AC360 couldn’t help but periodically mock the spectacle. Including one who playfully suggested they “all talk over each other.”