Proprint1 is absolutely right. (S)he is referring to mixing news programming with advertising, not advertising in general. IMO news programming (which in some cases is mandatory in order to get a transmission license) should be completely commercial free.
How can you trust the nightly news to tell you honestly about adverse drug reactions when its advertising revenue comes from drug companies? Or to tell you about unsafe tires when advertising revenues come from car advertising? Or maybe that guest doctor "educating" the viewers has book revenue to generate by over-emphasizing the seriousness/likelihood of the disease he is talking about.
News as entertainment with crap to sell - that is certainly not from where I want to learn the state of the world.
Worse than the problem however is that people don't see it is a problem. Apathy and a misguided belief that nothing can be done