When CBS announced that Stephen Colbert was going to replace David Letterman, it upset Rush Limbaugh so much, he almost started popping pills again.

Limbaugh went on a rant against the hire on his radio show.

"CBS has just declared war on the Heartland of America.  No longer is comedy going to be a covert assault on traditional American values, conservatives," said Limbaugh. 

He then continued "Now it's just wide out in the open.  What this hire means is a redefinition of what is "funny" and a redefinition of what is comedy, and they're blowing up the 11:30 format under the guise that the world's changing and people don't want the kind of comedy that Carson gave us or even Letterman.

They don't want that anymore.  It's the media planting a flag here.  I think it's maybe the media's last stand, but it's a declaration.  There's no unity in this hire.  They've hired a partisan, so-called comedian to run a comedy show.  So that's what I think."

CBS did not comment on Limbaugh's rant.