Especially brilliant was the Brass Eye Paedophile Special which satirised the media's obsession with paedophilia at the time so perfectly it did actually change things for the better. After the initial, predictable storm of protest that followed of course. I'd be interested how a US audience would react to that special. I'm sure you can find it easily enough on Youtube.
The real shit-storm about the paedophile episode was actually after it was repeated. The initial showing got complaints, but nothing like the attention the later showing was subject to.
Also, I think you need to consider Dermot_Morgan (most known outside Ireland for Father Ted) in the list of important political satirists and Scrap Saturday in the list of groundbreaking satire programmes.
Morris created the radio show "On The Hour", which transfered to tv as "The Day Today", and followed that with "Brass Eye".
You really should seek these out if you're interested in news and current affairs satire.
(Morris then went on to co-write "Nathan Barley" with charlie Brooker.)