There is a basement scene between Lincoln and Thaddeus Stevens which reveals Steven's true feelings about black people, white people, the Confederate...

There is a basement scene between Lincoln and Thaddeus Stevens which reveals Steven's true feelings about black people, white people, the Confederate States, the Confederate Leaders, and Southern people. Later, he is asked in the Congressional debate whether he believes black people and white people are equal. What is his answer and how does it differ from what his answer was expected to be? Why is this difference important?( in the film Lincoln 2012)