Revoke the press credentials of international reporters and confine them to their offices, that's how.
As blogger Max Boot said over at the blog Contentions, maybe there's a bright side to the Ahmadinejad 'victory'; Iran reveals its street-rat crazy thugocracy to the world, which the world can no longer deny exists. (As if somehow it could before.)
The irony between now and 1989 gets thicker.
(I'd love to comment on the Obama Administration's reactions and how I feel this is a huge opportunity to get Iran to the nuclear negotiation table while operating from a position of strength, but I'm a little busy, so maybe later.)