RCW: As stated in your Op/Ed, the primary goal for the United States, our Middle East allies and the global community, has been to prevent Iran from developing nuclear weapons. Even if Mousavi -- considered the father of the Iranian nuclear program -- somehow gains momentum and replaces Ahmadinejad, how much progress will the United States have made toward this goal?

Gen. Clark: We just don't know. That's a real question. There are contradictory signals based on the Mousavi's record and his background and the hopes of the people that are supporting him inside Iran. Honestly, we just don't know.