Nope, I’m afraid not. This will not cost him much with black voters. I wish it would, but the demagoguery that will be unleashed this year by the Left will have black voters out in full force. The same is mostly true of Hispanics. Obama will promise (for real this time!) to push for ‘comprehensive’ immigration reform, while Romney will be the evil xenophobe who wants to round up all illegals and split up families.
In other words, other issues trump this for blacks and latinos. That this isn’t too big a deal with those groups is proven by the fact that they haven’t injected even the slightest bit of conservatism into the Democratic party on this topic.
As for Muslims, well I don’t think it would matter much unless Michigan is very close, but I think they know that between Romney and Obama, Obama is the one most likely to bow down to Muslim rulers and pursue generally pro-Islam policies. I’m sure Obama would love to speed up already-accelerating Muslim immigration (though to be fair, on this Romney would probably be just as terrible.)
I hope I’m wrong and this does hurt him, but I just can’t be that optimistic about it.
That's why he's not bothering to hide who he is any more.
My money is on his creating his own private Reichstag Fire to give him an excuse to declare martial law and cancel the elections.