Tonight is where the plot thickens. What will it take to give either Kamala Harris or Donald Trump that critical edge in the final 56 days . And what trump himself is telling our reporter in a Phone Call just this morning about the big showdown tonight. Plus, could the key to winning this election be as simple as getting a small slice of undecided moderate voters comfortable with your candidacy . Maybe not so simple. How do you do it . And who has got the edge . And both Harris And Trump will leave pennsylvania once the debate is done, but likely not for long. Ill talk to two mayors in cities in pennsylvania. We got a lot of experience in what it takes to win in this all important state. So, it is a very busy day, hello, im chris jansing, joined by my colleague Andrea Mitchell for our Special Coverage, msnbc reports debate day. This is the Spin Room. And we are just blocks from where the first and so far only president ial debate will be held tonight. And, chris, Donald Trump is expect