Some say that Pandora has a "bigger footprint than local radio stations in some markets", a reason why they now try to rich out for political advertising money. Details explained by Dan Hirschhorn, AdAge.com.
AdAge :: Pandora, a streaming music service announced Friday that it's taking political advertisements on its website and mobile apps, joining Facebook and Twitter in the ranks of digital companies in the political ad business. The ads can be carefully targeted, the company said, even down to individual congressional districts. And Pandora, which already has audio ad breaks and display ads, promises a clean marketing environment, noting that only one audio ad is played for each commercial break.
Continue to read Dan Hirschhorn, adage.com