Rush: “CBS Has Just Declared War On The Heartland Of America” By Replacing Letterman With Colbert Written by Media Matters Staff Published 04/10/14 1:11 PM EDT From the April 10 edition of Premiere Radio Networks' The Rush Limbaugh Show: Previously: Stephen Colbert Lampoons Right-Wing Media For Asking If Hillary Clinton Is Too Old Colbert Mocks Limbaugh, Carlson, Doocy Over Their Global Warming Denials Colbert Highlights Limbaugh's Mockery Of Chinese President's Speech