Who's watching Glenn Beck?

[Commentary] For the first time in living memory, the Anti-Defamation League is sounding the alarm about a mainstream media personality: Fox News' Glenn Beck, who also hosts a popular radio show. The report notes that while "other conservative media hosts, such as Rush Limbaugh and Sean Hannity, routinely attack Obama and his administration, typically on partisan grounds, they have usually dismissed or refused to give a platform to the conspiracy theorists and anti-government extremists." By contrast, "Beck and his guests have made a habit of demonizing President Obama and promoting conspiracy theories about his administration. ... Beck has even gone so far as to make comparisons between Hitler and Obama." What gives all of this nonsense an ominous twist is Beck's announcement that he intends to use his TV and radio shows to promote a mass movement that will involve voter registration drives, training in community organizing and a series of regional conventions that will produce a "100-year plan" for America to be read from the steps of the Lincoln Memorial to a mass rally Aug. 28. It's hard to imagine any contemporary cable system dropping Fox News simply because Beck is an offensively dangerous demagogue -- not with his ratings at least. His new foray into politics, though, presents Rupert Murdoch's network with a profound challenge. Is it willing to become the platform for an extremist political campaign, or will it draw a line as even the authoritarian Catholic Church of the 1940s did? CNN recently parted ways with its resident ranter, Lou Dobbs -- who now confirms he's weighing a presidential bid. Does Fox see a similar problem with Beck -- and, if not, why?