Ken Burns did "Baseball", but I'm pretty sure When It Was A Game is not his work. At least I don't recall him having anything to do with the making of it.
Galen is right about MLB's silliness in refusing to call the Playoffs the Playoffs, but otherwise, I'd say stick to politics. I'm as big a baseball fan as anyone and have read all the books and watched all the documentaries about baseball as a metaphor, but it's really grown old. Leave it to Roger Angell and maybe Bob Costas because he can't help himself.