This week Katie and Joe preview Joe's new series "The Professionals" where we give you the inside story of what really drives a presidential campaign. We'll break down what makes a campaign successful and why some candidates come up short. Our experts meet two important criteria - they're not actively working on a campaign now (so they can be unbiased) AND they've been involved at a senior level for multiple presidential campaigns.In the pilot episode Jen Psaki, Paul Begala and Ron Klain take you behind the scenes of presidential debate prep.