joining us now, allen lichtman, presidential historian at american university, co-author of fdr and thet jackie, about that fateful day, november 22nd, in dallas. but i feel like not enough has been said about that transition to lbj. what can you tell me or what are your views about that transition, that awkward moment, of course, of the swearing in with jackie wearing the blood stained suit, and how this new now president had to also console a grieving widow, and at the same time try to maintain or continue on with the hope that was always associated with jfk. >> in the tragic flash of a moment, lyndon johnson went from holding an office that john adams, previous vice president in the early republic had said was the most useless office in the history of the world, to suddenly becoming the most powerful leader of the world. and this was an absolutely delicate transition. and johnson wasn't known for his delicacy. he was known for his crudeness and overbearing manner. yet he handled it with exquisite graciousness. he was incredibly outgoing. he wrote letters to john f kennedy's children