Campaign spending increases each election cycle; this year, almost $16 billion will be spent on races across the country. Who is the money coming from and what do they get in return?This episode: national political correspondent Sarah McCammon, political correspondent Susan Davis, 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 nprpolitics@npr.orgJoin the NPR Politics Podcast Facebook Group.Subscribe to the NPR Politics Newsletter.