aramis erak
Legend
I guess I'm trying to equate campaign to game. You play the campaign - whether it's a single one shot adventure, or a ten year long epic. While playing that campaign, you don't play other campaigns (at least not with the same characters typically).
You see it in the language that people use. They're playing Against the Giants. They're playing whatever campaign they happen to be playing.
I don't hear people talk that way; I see it only online. Even in Organized Play, the people I've been exposed to in both Alaska and Oregon talk about the game system, not a campaign title. And a handful of old grogs call every RPG "D&D."