without the words "under god" was provided for president obama and only president obama to read to highlight the fact that there are different versions and there are different versions, five of them, in fact. two of them do not include those words, three of the other versions that lincoln wrote up later after the address do include the words. you read one of those versions and i think also worth noting, when you look at the dozens of people who participated in this project, you're in pretty good company. not just the president but you had usher and taylor swift doing this as well. >> they are saying the president didn't directly participate in gettysburg because of scheduling problems, is that right? >> reporter: they're saying, we have heard that it has to do with scheduling. we also had heard from ken burns on this project that one of the reasons that he didn't do this, that president obama told him he was working so much on being involved in the commemoration of the march in washington that he couldn't do two of these really big sort of commemorations in