This one came up on the shuffle today. "The Assassin" is, in my opinion, Patterson Hood's best song and also my favorite of the select covers Jason does. Patterson put the song on his his 2004 acoustic solo release, Killers and Stars, but Jason and the 400 Unit make it a top shelf rock song, slide guitar and all. I've heard there is a studio version from Jason's Sirens of the Ditch sessions floating around, but I don't have it and I can't imagine it lives up to the raw live versions.
I've posted a couple audio tracks and good quality video version to check out.