Iran Elections: "Landslide Ahmadinejad"--NOT

Very exciting events in Iran. What I wonder about though--what if instead of stealing a landslide, the Ahmadinejad government had settled for stealing a close victory? A win is still a win, after all. But a more plausible win would have let them claim, more plausibly, that they had not stolen the election. After all, it was good enough for Lyndon "Landslide" Johnson.