Colbert on Letterman

Stephen Colbert may take the plight of undocumented immigrants seriously, but he showed no signs of getting too serious about his March to Keep Fear Alive on Letterman last night. Click here for more videos.

Updated Apr. 24, 2017 5:24PM ET / Published Oct. 08, 2010 10:03AM ET

Stephen Colbert may take the plight of undocumented immigrants seriously, but he showed no signs of getting too serious about his March to Keep Fear Alive on Letterman last night. Click here for more videos.