we are back with robert caro, the great american historian talking about john f. kennedy and the assassination. you know there are people who look at where johnson was dead in the water, a life magazine article was about to come out. you describe an investigative story that would further undermine him. people look at all that and say this assassination really not only made johnson president but saved him from what might have been a complete collapse and is it possible that had the assassination not happened, johnson would have been so humiliated he would have had to resign? >> johnson to answer that part of your question, johnson himself felt that whether he had a second term or not, he was finished. that's the word he used. i'm finished. you know how we know that he really felt that way, he told