 Tonight's debate is in Atlanta because Georgia is a swing state. It's also where CNN calls home. And because Bash and Tapper are the moderators and because this is CNN, the two will ask Biden softball questions. I wanted to give you my best guess preview, but first, before you tune in tonight, you should know some of the ground rules from the candidates' perspective. CNN did a pre-debate explanation of how the muted mic debate will function in that regard. I wanted you to see it. Here it is.