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. ”