Runs the risk with whom? Racist *******s?
Actually I think it is worth considering that group. Extremist organisations will go looking for any percieved injustice to hang their flag on and having a black president probably does give them some traction they wouldn't otherwise have. I don't think that's what Witis is driving at and it would seem a frankly bizarre basis to condem the Obama presidency on but it's an interesting point none the less.

On the other hand...

Witis, you cannot seriously be comparing the Obama presidency to Apartheid. The difference isn't in the fact that both were/are governed by a leader from an ethnic minority - you're right that they are similar in that regard. The difference is that in South Africa the minority we the elite and used that position to impose legislation on the majority that turned them into second class citizens. America is the exact opposite of that. The black minority are most definitely not an elite (I think I'd be comfortable saying they're still an under-class but I apreciate that might be arguable in some quarters) and I've seen absolutly no evidence of them trying to turn the majority caucasion population into second class citizens. Obama's presidency, whether people like him and his policies or not, represents a huge milestone on the path to full racial integration and equality in the US. Apartheid represented an absolute lack that dynamic in South Africa.