Robert Caro is widely acknowledged to be America's foremost political biographer.
This year he published the fourth volume of his monumental work The Years of Lyndon Johnson, a project to which he has dedicated the past 36 years.
Today presenter James Naughtie spoke with him earlier this week and asked him, as America's 57th presidential election approaches, what has changed about the practice of American politics since Lyndon Johnson?
"We have this ideological split in America between the tea party and, you might say, the liberals and progressives," he pointed out, and liked it to a "deep split" within the party at the time of Lyndon Johnson.
He went on to warn of his "worry" that "the more money poured into politics, the more chance there is that the democratic process will be bent off that democratic base."
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