Republican voters in Iowa have two presidential nominating contests next week, a primary on Tuesday and a caucus on Thursday. We explain why. This episode: national political correspondent Sarah McCammon, political correspondent Ashley Lopez, and senior political editor and correspondent Domenico Montanaro.This podcast was produced by Jeongyoon Han, Casey Morell & Kelli Wessinger. Our editor is Erica Morrison. Our executive producer is Muthoni Muturi. *Listen to every episode of the NPR Politics Podcast sponsor-free, unlock access to bonus episodes with more from the NPR Politics team, and support public media when you sign up for The NPR Politics Podcast+ at *plus.npr.org/politics).**Connect:**Email the show at [email protected])Join the NPR Politics Podcast Facebook Group).Subscribe to the NPR Politics Newsletter).Learn more about sponsor message choices: podcastchoices.com/adchoices)NPR Privacy Policy)