http://mediamatters.org/blog/2015/07/28/veteran-republicans-say-right-wing-media-is-a-b/204634
"The conservative media's influence on the Republican Party has become a key story during the 2016 presidential primary season. Fox News has an unprecedented media role in the process, as it is hosting the first Republican debate and using polling to cap the number of debate participants at 10. Candidates competing to get into the debates are now frequently appearing on the network's airwaves, and their allies are spending big money on advertising to reach Fox's conservative audience."
