Why is it more common to see black male/white female couples than white male/black female on TV?

Just in the last few years I have seen a large increase in Southern California of white male black female couples. I have dated quite a few black females but none of them were born in America. I think President Obama and several other sports and TV personalities have had an impact on the black culture in this country were we are seeing more and more blacks better adapting to a mainstream culture, language etc.