By Brian Stelter, CNN
Letterman called Colbert "always entertaining," "the new kid" and "my friend." What Letterman was saying, implicitly, was that he supported CBS's pick for his successor.
CBS announced that it had signed Colbert to a multiyear deal back on April 10, one week after Letterman revealed that he intends to retire in 2015.
Read more of Brian's article online here.