This week: what to expect ahead of Saturday's GOP primary in South Carolina and Democratic caucus in Nevada. Plus a word about Donald Trump facing off with the Pope, and what the NPR Politics team just can't let go this week. This episode: political editor Domenico Montanaro and campaign reporter Sarah McCammon join hosts Tamara Keith and Sam Sanders. Find the team on Twitter @DomenicoNPR, @sarahmccammon, @tamarakeithNPR, @samsanders, or at npr.org/politics — or email the show at nprpolitics@npr.org.