Westwood One Radio Network is owned by Infinity, a subsidiary of Viacom. Viacom’s other properties include CBS. CBS just refused to run issue advertisements during the Super Bowl.
Oddly, on the Westwood One pregame Super Bowl show, I just heard two advertisements for LDS Family Services. I didn’t find either of them objectionable; they were both pro-adoption ads designed to encourage people to give unwanted children up for adoption. I’m pretty sure they both counted as issue ads.
CBS is making up policies as it goes along.