As I (and the rest of the planet) wrote about Wednesday, Glenn Beck will soon leave his Fox News show. There are some really good takes on this. I'm partial to The Atlantic's version, which gives several reasons why it may have happened -- from Beck is too crazy even for Fox to his drop in ratings to fleeing advertisers to, well, Beck's gotta be Beck, and he'll do it better somewhere else.
The political effects of such programming are not inconsequential. Reaffirming beliefs, providing talking points to the faithful, those are significant effects and often watching or listening to this stuff pushes these folks even more to the extreme, and it tends to make them even less likely to entertain argument from the other side. If indeed Beck went too far, we might take this as a good sign that even Fox has limits on its conservative brand. But I suspect it's more a financial than journalistic decision, assuming Fox actually makes decisions based on journalistic ideals.
In other words, what's happening to the Republican Party is also happening to its primary information organ -- Fox News.