Khamenei to Moussavi: ...You Decide whether your opposition remains in the realm of politics, or cross over into the realm of "by other means"...

Judah Grunstein in the WPR, here

"... the moment another march heads out, there really is no turning back, either for the opposition or the regime. And the standoff, which so far has been somewhat static or parallel-tracked, becomes a collision-course game of chicken.....Should Moussavi cross that line, or should the demonstrators do so without him, they enter into open revolt. At that point, the battle widens, with the center of gravity being no longer only the hearts and minds of the Iranian populace, but those, too, of the Iranian security apparatus...."