I'm going with the Black Man.
Republicans are too stuck in their ways...people in general are old school...they would automatically assume the the White House would become Sausage Fest 2008...omg ...we would have a First Man instead of First Lady. Only way dude could pull it off is if he comes out after the elections...but people pull all kinda stuff out your past so I doubt he would make it that far.
BTW in response to other posts...
The original founding documents of the United States did guarantee equal rights for all citizens... provided that...
1. You are a male
2. You are Caucasian (depending upon the location in question; there were Black burgesses in the New World)
3. You are a landowner (in other words had $)
as others were not seen as being relevant to the governing process.
Whether this constitutes equal rights is a matter of debate. By modern standards, the answer is no. Others would argue that since that was not the same type of society, our modern standards don't apply.