If you think liberals groan every time they see Glen Beck, I can only imagine it's doubly worse for any intelligent conservative (yes they exist.)
Maybe Glen Beck is an idiot, maybe he isn't. The strategy behind his show though is the same as the "Bring out the base" concept that elected Bush and it's no fool of one either. If through emotional appeal, you can play to people's fears of God and Communism, they become immune to any logical argument against you. Glen Beck is not out to convince people. He exists to get the people who agree with him riled-up, active, and staunchly opposed persuasion. This strategy is fueled by things that grab attention, thus stunts like this book cover.
If there's someone to be furious at, it's Rupert Murdoch. Glen Beck is nothing but the forked propaganda tongue of that poisonous old snake. Without Glen Beck, the Daily Show would lose it's main source of humor. Without Rupert Murdoch (and men like him), the world would be a far better place.