Republicans across Iowa will gather Monday night at 7:00 pm CT to caucus for a presidential candidate. What does that mean? We tell you how caucusing works, what you should watch for on Monday & how Iowans are reacting to former New Jersey governor Chris Christie suspending his campaign. This episode: senior White House correspondent Tamara Keith, national political correspondent Don Gonyea, and senior political editor & correspondent Domenico Montanaro.The podcast is produced by Jeongyoon Han, Casey Morell & Kelli Wessinger. Our editor is Erica Morrison. Our executive producer is Muthoni Muturi.Unlock access to this and other bonus content by supporting The NPR Politics Podcast+. Sign up via Apple Podcasts or at plus.npr.org. Connect:Email the show at nprpolitics@npr.orgJoin the NPR Politics Podcast Facebook Group.Subscribe to the NPR Politics Newsletter.