Lorne Michaels has his hands in everything (including SNL), so that doesn't necessarily mean very much. He's very good at finding talent though. That said, yeah portlandia is pretty close probably, not sure why it didn't occur to me (I guess I was thinking more 90s-contemporary).

Still I think the thing is none of these suggestions really rise to the top of the culture the way KITH does for Canada or Monty Python does for the UK, or the way (as a different but related sort of thing) SNL does for the US.