Here is a transcript of his speech: this detail struck me:
I trust the American people to understand that it is not weakness, but wisdom to talk not just to our friends, but to our enemies, like Roosevelt did, and Kennedy did, and Truman did.
Obama's supporters are too young to know any of this, but Roosevelt led the United States in the war against Hitler; the Allied policy was unconditional surrender, so there was very little for Roosevelt and Hitler to discuss, and in fact, the two did not meet at all (but they did exchange correspondence before the war).
So my guess is that Obama is thinking of the Yalta Conference with Churchill and Stalin as talking to "our enemies", although of course we were still allied with the Soviet Union against Germany and Japan at that point. Beyond that, is the Yalta Conference something Obama and his advisers view as a success worthy of emulation? Puzzling.
I believe in our ability to perfect this nation, because it's the only reason I'm standing here today. I know the promise of America, because I've lived it. Michelle has lived it; you have lived it.
It is the light of opportunity that led my father across an ocean. It's the founding ideals that the flag draped over my father's coffin stand for. It is life and liberty and the pursuit of happiness.
It's the simple truth I learned all those years ago when I worked in the shadow of all those shuttered steel mills on the south side of the Chicago, that, in this country, justice can be won against the greatest odds, hope can find its way back from the darkest of corners.
And when we are told that we cannot bring about the change that we seek, we answer with one voice: Yes, we can.
"Michelle has lived it"? Any reasonable person would say that Michelle has lived the American dream, but I am not talking about a reasonable person - I am talking about the woman who whines about loneliness and crushing college loans every time she speaks. Well, maybe they will gently ask her to go to re-write and try to find something to smile about.
ERRATA: "It's the founding ideals that the flag draped over my father's coffin stand for" - shouldn't that be "grandfather"? Presumably granddad was entitled to a military funeral; dad was off in Kenya IIRC, probably not with an American flag.