Limbaugh gets paid big bucks to stir shit. Some of his supporters are angry, sure. But there are plenty of other people of other ideologies that are angry, too. I used to speak with a woman about my mother's age online quite frequently. Supernice lady I wouldn't know otherwise, as she lived far from me, was of a different race and generation and socioeconomic class (she was pretty upper middle class). Dyed in the wool Democrat, and very, very angry about Republicans, and GWB especially. Now, apparently Republican partisans are carrying the baton and are equally angry at Obama and the Democrats. It's all a crying shame, if you ask me.
The world today (at least in America, unfortunately I am too provincial to be able to comment with any authority on other nations) seems like a very scary place to be living in. People are losing jobs and finding it hard to replace those jobs. Technology is evolving faster, news comes at us from all directions, filtered through the sources' various biases. We're fighting a war on two fronts, and our young people are dying and being wounded there. Our politicians think nothing of demonizing each other, and people are afraid to even smile at each other on the street in places. Our children are going to be growing up in a place that sometimes even we adults have trouble comprehending. It's easier than ever to get freaked out about the state of the world and our place in it, if you're vulnerable to it. If someone is ready, willing, able and handsomely paid to stoke the fires of that fear with a ready-made boogeyman, well...the results are pretty predictable, to my way of thinking.