Glenn Beck, Sean Hannity, and Rush Limbaugh are losing fans in a key market. Year-end to year-end comparisons of the crucial 24 to 55 demographic show that Rush declined from 3.7 to 2.6—while his packaged follow-up acts Sean Hannity and Mark Levin narrowly declined and flat-lined, respectively. John Avlon writes about it and points out a possible rising star to replace this radio icons. Read more.