Calling it like I see it here, this is an opinion. I grew up with black folks. If you see this as racist, then you have a problem with yourself.
I think if Romney wins, Obama's black supporters in the inner cities will riot. If not, there will be some kind of protest over it, and of course, calls of racism. In such a riot they would destroy their own neighborhoods just like watts in the 60's (?) and after rodney king. Menwhile white liberals will find a reason to ignore, or justify said protests/riots out of white guilt, but will not decry it in any way.
I think if Obama wins, his black supporters will celebrate llike crazy. Romney supporters of all colors will accept the win as they do the rule of law. They won't do much right away, but what they do will be within the law, and they will work within the system, as long as it isn't changed against them.