There's a wonderful, perhaps apocryphal story that....

“ There's a wonderful, perhaps apocryphal story that people tell about Daniel Patrick Moynihan, the brilliant, prickly, and iconoclastic late senator from New York. Apparently, Moynihan was in a heated argument with one of his colleagues over an issue, and the other senator, sensing he was on the losing side of the argument, blurted out: 'Well, you may disagree with me, Pat, I'm entitled to my own opinion." To which Moynihan frostily replied, "You are entitled to you own opinion, but you are not entitled to you own facts. ”

Barack Obama

From : The Audacity of Hope: Thoughts on Reclaiming the American Dream