Media Monitors is following political spending on radio in 85 major markets, and for the week of September 2-11, Libertarian candidate Gary Johnson led the field with 17,499 ads. In the number two position, Trump-supporting Liberty Action Group PAC ran 1209 ads. Number three was another Trump advocate, the Great America PAC, with a big 67 ads. Bringing up the rear is another Trump-flavored PAC, Rebuilding America Now PAC (two spots) and the Trump campaign itself (one spot). You can follow along at home at www.mediamonitors.com.