Robert A. Caro said this quote

It was Abraham Lincoln who struck off the chains of black Americans, but it was Lyndon Johnson who led them into voting booths, closed democracy's sacred curtain behind them, placed their hands upon the lever that gave them a hold on their own destiny, made them, at last and forever, a true part of American political life. How true a part? Forty-three years later, a mere blink of history's eye, a black American, Barack Obama, was sitting behind the desk in the Oval Office.

~ Robert A. Caro

You know,' Russell said, 'we could have beaten John Kennedy on civil rights, but not Lyndon Johnson.' There was a pause. A man was perhaps contemplating the end of a way of life he cherished. He was perhaps contemplating the fact that he had played a large role - perhaps the largest role - in raising to power the man who was going to end that way of life. But when, a moment later, Richard Russell spoke again, it was only to repeat the remark. 'We could have beaten Kennedy on civil rights, but we can't Lyndon.

~ Robert A. Caro

No southerner had been elected President for more than a century, and it was a bitter article of faith among southern politicians that no southerner would be elected President in any foreseeable future; when members of the House of Representatives gave their Speaker, Sam Rayburn, ruler of the House for more than two decades, a limousine as a present, attached to the back of the front seat was a plaque that read 'To Our Beloved Sam Rayburn - Who Would Have Been President If He Had Come From Any Place but the South.

~ Robert A. Caro

He not only had the gift of “reading” men and women, of seeing into their hearts, he also had the gift of putting himself in their place, of not just seeing what they felt but of feeling what they felt, almost as if what had happened to them had happened to him, too.

~ Robert A. Caro