So, turns out, Valerie Plame was working on tracking the nuclear capabilities of Iran. When her cover was blown (and that of the fake company she was working for, putting who knows how many others' lives in danger... we'll never know the true human toll of this outing), our intelligence abilities were damaged.
So, if we're really all that concerned about Iran, why was the leaking of Plame's identity authorized from high levels? Clearly, playing politics was a bit more important than, you know, national security. Lovely.