It has been suggested that Obama is well-advised not to speak up in favor of the dissidents because taking their side would enable the regime to de-legitimize the opposition as tools of evil America. Some have even speculated that the Iranian opposition has asked the U.S. to remain largely silent.
The former claim is extremely difficult to assess; the latter is probably impossible. But we can note the tension between these claims and the view that Obama has made major inroads in influencing Muslim public opinion. For if Obama's popularity extends beyond Iran's student activists and intellectuals, a group that traditionally is pro-American or has no serious quarrel with the U.S., then his support should not be a liability for the opposition. And if his broader popularity is somehow contingent on not criticizing repressive dictators, then that popularity doesn't seem worth cultivating except for egotistical reasons.