In his speech on the Arab world on Thursday, President Obama evoked images of the American Revolution, the Civil Rights Movement and the Fall of the Iron Curtain to parallel American values and the Arab uprisings. The speech comes nearly six months after the uprisings began in Tunis, and the state of democracy in Tunisia and Egypt is precarious at best. But what concrete steps is Obama promising –  and can he come through? Joining us is David Sanger, chief Washington correspondent for our partner The New York Times and host of The Washington Report on our sister station, WQXR.