So I confess I never played the coop campaign of Portal 2. I played single player when it came out, but knew no one at the time for coop. But starting a new thread just for me seamed a bit excessive.
My Idea was to start a pyramid scheme. If someone wants to (re)play the campaign. I would play it with the next person who wants to play though it, maybe for the first time. If I'm not alone with this omission. Otherwise this would of course fall flat.