Is White the New Black?

Having lived in the UK and US on or off for the last 8 years one of the things that is noticeable is the absence of mixed race couples in US advertising whereas in the UK it is entirely unremarkable. In London, where I lived until recently, based on looking at couples on the Underground, mixed race couples seemed to make up about 30% (very approximately) of couples where at least one of the partners was black. This seems to be about the same percentage I have seen in (entirely uncontroversial) UK advertising. I have never seen a mixed race couple in a US advert.

Will Obama's election change attitudes in the U.S. to miscegenation in advertising?