text:  Alex, here we go. It's the most consequential moment of this debate so far. And when these two candidates walk on that debate stage in just a few moments, it will be the first time that they have seen each other in four years. Big questions tonight of whether or not they'll even shake each other's hand. Of course, tonight will look a lot different. The candidates' microphones will only be turned on when it's their turn to speak, and no studio audience to cheer them on. We'll have to see which version of the former president shows up tonight, the one that's on the attack or the one that wants to stay on the message, and whether or not President Biden's mock debates,