I was trying to confirm myself, but that's got to be Ted Leo. He's currently in a band called The Both with Amiee Mann who famously guested on Portlandia in season 1. Fred Armisen has played shows with them recently.
Here's a sketch Ted and Amiee did with Vanessa Bayer (who also guested on Portlandia in Season 4):
http://aboveaverage.com/watch/sound-advice/aimee-mann-ted-leo/