Late Night Pick: Jason Isbell & the 400 Unit

Some nights the late night pick is easy to make and this is one of those nights. Not only do you get the former guitarist/singer from one of my favorite bands, Drive-By Truckers, as the musical guest. That would be Mr. Jason Isbell and his new band, the 400 Unit. You'll also get Samuel L. Jackson. And Carrie Brownstein & Fred Armisen will be on the show talking about the new season of Portlandia, which starts in January. Where is all this? Why it's tonight on Late Show with David Letterman on CBS at 11:35 PM.