There was no way this topic was every going to be "Mama Mia!" It's not a fun movie, though it is carbonated with a spritz of Jon Stewart and Saturday Night Live. But it is an important film, and it is its gravity that keeps one in orbit, even as one wonders when it will be over. It could have used a bracing round of editing to tighten it up, sharpen its focus. But it is rightly considered the "Inconvenient Truth" of the deficit crisis. It is important to our future as a nation in the way that climate change is important to our future as a species.