PJ Media has this bit on the AssPress.
Many if not most Americans have no idea how often they meet up with AP content every day. Those top-of-hour two-minute syndicated radio broadcasts you hear on the way to and from work? There’s a good chance that at least half of its content was adapted from AP copy. The national and international stories in your newspaper’s print edition and at its web site? Most of it probably came from AP. The national TV networks? In terms of beat reporting, they’re mere shadows of their former selves, and liberally use content from AP — and, to a lesser extent, the New York Times, which is no longer even trying to be the “newspaper of record” it was in previous decades — as their starting point, and often their ending point. This in turn filters down to local TV newsrooms, which don’t have the resources to pay much direct attention to goings-on outside their city or state.
Organizationally, the AP is the oddest of entities, a “not-for-profit cooperative of news organizations … solely focused on finding, reporting and distributing news.” Its tax status gives it an obvious advantage over anyone who would dare try to launch a competitive enterprise of similar scope (gosh, is AP even exempt from sales tax on purchases of materials?). Although some dues-paying news outlets have become restless in the past few years, it is relatively insulated from the normal financial pressures businesses face.