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I asked the same question? I've re-read Glenn's post and it is a little confusing here, and he should clear it up in an update:
"and that's particularly true where -- as is the case for Rep. Carney's district -- one company controls the bulk of the important television outlets. In an age where corporate consolidation of our most influential media outlets is increasing rapidly, companies such as Comcast can suppress the expression of political views it dislikes -- or conceal their own illegal behavior -- by censoring any political viewpoints that are contrary to their interests or to the interests of the political figures who receive substantial contributions from them and then serve them. Obviously, that is precisely what Comcast is doing here."
I can't tell if the ad was submitted to Comcast the Cable provider to run in its local markets, or if it was submitted to television companies owned by Comcast (and perhaps also broadcast by Comcast)in those markets.