If you as a corporation want to make sure you reach the craziest demographic possible, you should advertise on Glenn Beck. There are, at least ten to twenty-million total right-wing crazies in this country and they are clearly willing to go to the same source for their slop repeatedly.
If you're Cadillac or Lexus you advertise on golf broadcasts, if you sell viagra any sporting even will do, especially golf and football. If you sell soap, there's a reason they were originally called soap operas. Which is why Beck's most dependable advertisers are "home security" systems and "gold venders". If Sealy Posturepedic starts selling mattresses with special internal hidey-holes Beck would be an ideal source for them as well.