In this special holiday edition of the weekly roundup, campaign reporter Scott Detrow and congressional correspondent Susan Davis join hosts Sam Sanders and Tamara Keith to discuss the democratic debate, the Bernie Sanders campaign data controversy, and Paul Ryan's year-end budget deal. Plus a special political version of The Night Before Christmas by NPR's Ron Elving. Find the team on Twitter @samsanders, @tamarakeithNPR, @scottdetrow, @DaviSusan, and npr.org/politics.