Seven mayoral candidates stood on stage last night at the first official Democratic primary debate, but most of the focus was on criticizing front-runner Bill de Blasio. David Chen of the New York Times helps play highlights from the often heated 90-minute exchange, and discusses what we learned about the candidates less than a month before primary day. Listeners: What'd you make of the debate? Did it help you make up your mind, or change your mind? Call 212-433-9692 or post below.