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b'It was the secret force behind stories about John Edwards\\u2019s $400 haircut and Mitt Romney\\u2019s decision to put the family dog on the roof of his car. Donald Trump Jr. says it motivated him to meet with a Russian lawyer. We discuss the dark art of opposition research. Guests: Jonathan Martin, a national political correspondent for The Times; Ben LaBolt, the national press secretary for President Barack Obama\\u2019s re-election campaign. For more information on today\\u2019s episode, visit http://nyti.ms/2vF4L6w.'