Why Give Ahmadinejad Two-Thirds Of The Vote?

Drum has some smart thoughts:

[W]hen autocracies decide to do something like this, why do they do it so clumsily?  Why not give Ahmadinejad 52.7% of the vote, which would be at least within the realm of reason?  Or force a runoff and let Ahmadinejad win a week from now?  Why perpetrate such an obvious fraud?

Hard to say.  Maybe it's just too hard to orchestrate something more believable.  Maybe, against all evidence, they believe that smashing victories are always more convincing than close ones.  Maybe it's just rank panic and stupidity.  It's a mystery and a counterproductive one, too: there isn't a person on the planet who thinks that Ahmadinejad could have won two-thirds of the vote with a turnout of 85%, and the possibility of inciting an internal revolt is a lot higher with a barefaced fraud like this than it would be with something a little more subtle.

On the other hand, maybe we're looking at this through the wrong lens.  Obviously something about Mousavi started to badly spook the powers-that-be during the past week, and maybe they decided something needed to be done about it.  Maybe they wanted to provoke a round of violence from Mousavi's supporters as an excuse to lead a crackdown on dissidents.  And what better way to do that than to make the election rigging so obvious even a child could see it?