Rush Limbaugh is fast becoming a "relic," "as dated as Jazzercise or 'Macarena'" – or so says CNN regular Dean Obeidallah in a new CNN.com op-ed. Ironically, a CNN contributor is calling someone else irrelevant. But in all seriousness, Obeidallah gloats over Limbaugh's lost ad revenue in the past year and points to his inevitable decline: "Has Limbaugh become as dated as Jazzercise or 'Macarena?' All you need to do is look at the bottom line to see that Limbaugh is in trouble." "Regardless where he turns up, Limbaugh will likely not be as relevant to the national media as...