The Administration flacks sense they are in trouble and are lashing out at the biggest, closest target. But, Fox is only responding to what people want, which is less about how many unicorns are on the way from National Barak Channel, PMS-NBC, the All-Barak Channel, See-BS, the Washington Posterboy, and the New York Slimes ('All the news we see fit to print'). Fox would stop in a minute if it wasn't what people wanted to hear, and that fact is why the papers are dying and Fox is kicking the ass of all the broadcast media. The (Comparative) aggressiveness of Fox News and its success are a symptom, not the disease.
Odd that they aren't objecting to all the bias in those other media, innit?