You raise some interesting issues.
Firstly, in some senses we're actually ahead of the States - they have yet to release season 5 on DVD - due out in December!!! However, they do get extras on the region 1 DVDs that we don't get...
As for the live debate, for sites I've been on, I get the impression that they did the show twice - once for the east coast and once for the west coast because of the time differences... I'm not sure how much these versions differed from each other, though or how much was script and how much was ad-libbed.
I do know that the issues raised are the ones that a real issues - protecting the border between the Us and Mexico, renewable sources of energy, taxes and medicare.
The show has also set up campaign websites for Vinick and Santos which are available from a link provided on the show's official site. It includes issues and biographies and basically treats this whole thing as if it's real.
There's even a poll there to gauge popular opinion.
I think it's quite cool really. What would be great is if the shows viewers got to choose the next President... there's power to the people!!!
JOSH: I'm thinking of firing you.
DONNA: You fired me twice already tonight--I'm impervious.