What Obama does here will mark his legacy as an international president. Egypt has just gone web-dark. The ruler, a US backed dictator in power for 30 years, is facing mass and popular uprising. He has dissolved his government but so far shows no sign of accepting his fate and stepping down.
He did want to make his mark I think on finding a peace between the Palestinians and Israel but fate has funny way of thwarting one's designs. Egypt, suddenly, conscripts him to the front.
He is bound because the security of Israel is bound up in the security of her neighbours, which in Egypt's case is underwritten by US arms, money, and tame dictator. He has to balance what I believe is his sincere belief in democracy and rights, with the US role as a guarantor of regional security suddenly dealing with the loss of one of those pillars. And he has to balance whatever he wants to do with the political reaction from the rightwing insane machine at home.
What will the Democrat, constitutional law professor, and US President do? Sit tight, say little, until the dust settles would be my guess. Whatever he says now may come back to haunt him should he and his advisors misread the outcomes.