Just those documented crazy people going after public figures, saying they listened to Beck and he influenced them, like the guy caught on the way to kill folks at the Tides Foundation, as Glenn Beck recommended on his show:
http://mediamatters.org/research/201101130002
Glenn isn't pesonally responsible for these folks. But he is responsible, having a public forum, to realize that his verbal attacks on people and public calls for action could be taken very, very seriously by the crazy. You know, like Bill O'Reilly repeatedly calling a particular physician a baby killer, saying someone should take him out - and dang, if someone didn't do exactly that.
Glenn Beck is a shock jock, who knows how to rile his audience up for ratings. The President is a racist, people should be killed, the world is ending and buy gold, yak, yak, yak. He excels at scaring old white people.
Beck lost all his "real" advertisers with the racist comments. He's free to speak, and America is free to respond.
Did you buy your gold yet, Geeker? Have you purchased your dehydrated meals so your family will not starve during the apocalypse?