you know, lord acton says "all power constructs... absolute power krupps absolutely." i don't think that's always true. what i think is that power reveals. johnson gets power and for the first time we see what he means to do with it. >> rose: robert caro on lyndon johnson when we continue. captioning sponsored by rose communications from our studios in new york city, this is charlie rose. >> rose: robert caro is here. he is a two-time pulitzer prize-winning historian and biographer. he has spent more than 30 years of his life chron klg the life of president lyndon baines johnson. there's these three books already out "the path to power, means of ascent, master of the senate" and now this book, it is called "the passage of power." it clearly is the passage of power from president kennedy to president johnson. it is a remarkable book and many people have talked about it. columnist in george will has said that when the multivolume series is complete it will rank as america's most ambitiously conceived, assiduously researched and compulsively readable political biography.