Neilsen has published some fascinating details on how the presidential candidates are spending their media money and what kind of results they're getting for it. MarketingCharts.com has the numbers; here are some highlights:

At last week's New Organizing Institute/IPDI-sponsored Google presentation on advocacy tools, after looking at Google Ads and answering questions about click fraud, the company's Elections and Issue Advocacy team touched on a new tool whose potential political significance jumped out at me. More than a year ago, Google snapped up a company that was developing an online interface for buying radio advertising, and despite some skepticism about its usefulness, the product looks to be moving out of beta fairly soon.

You can get a good overview of how the ordering system will work here; note that you can specify stations by location and genre, set your own budget, choose your time of day to run ads and get some reporting after-the-fact. You upload your own ads as mp3s, though the site will help you find a company to build them if necessary. Groovy! Basically, you can run ads across the country from a single interface — you won't need to work with different ad reps for individual stations or chains of stations. With 1600 AM and FM stations in the network, and the top 10 stations in 24 of the 25 biggest media markets in the country, Google claims the potential to reach essentially 100% of the U.S. population.