THE BECK EFFECT

I recall that Rupert Murdoch told a questioner that despite losing advertisers, The Glenn Beck Show has helped the ratings of the FAUX News shows that come on after the Beck show and now Mediate repeats this assertion:

Not only has Beck developed a loyal following, but his ratings have an enormous promotional effect as lead-in to the shows that follow him (though to be fair, Bret Baier at 6pm has been improving on Beck’s ratings of late.)

So far, I haven't found any evidence online of a carry-over effect.