I'd like to point out that affirmative action directly leads to more racism. I've heard many racists assume that affirmative action is the sole reason someone (is in college|has that government job|got that scholarship).
In any case, according to this research, Obama's first term didn't improve racist attitudes in America.
Prejudice has risen since 2008 Obama victory:
https://bostonglobe.com/news/nation/2012/10/27/poll-majority...
Remember, the road to Hell is paved with good intentions.