President Obama has taken a cautious tone toward the demonstrators in Iran, with his stated reason being that more open support would discredit their cause. This strikes me as a sensible position. The revealed preferences of both sides suggest a mutual belief that an American embrace would hurt the protestors. The regime is trying (so far, without much success) to tie the demonstrators to the U.S., and the demonstrators are embracing the symbolism of the Iranian revolution (the color green, chants of "Alluah Akbar," and so on) in order to demonstrate their patriotism and mainstream cultural status.
Still, this kind of judgment about an unfamiliar country's internal politics is just a guess, and it's a rebuttable proposition. What's remarkable to me is that those on the other side refuses to rebut it. Today's Washington Post op-ed page has two more columns lambasting Obama for failing to embrace the demonstrators. Today's offerings are by Charles Krauthammer and Paul Wolfowitz. Neither one of them even mentions, let alone answers, Obama's argument for why embracing the demonstrators would be counterproductive.
I don't understand how you could write a column without ever once addressing the primary argument for the proposition you're arguing against. The low quality of argument on this topic from the right is striking.