I've heard about that one, but I haven't actually read her words in context. Knowing how she operates, I would bet that her words were taken out of context. She was probably being sarcastic, and I suspect that, in context, it would be obvious that she doesn't actually believe that women should not be allowed to vote.
I heard her say it on CNN the other day, but I think she's said it before. I don't think she was trying to be sarcastic; I think she's trying to be controversial and, if possible, outrageous.
I don't think for a minute that she really means it, though. ;-)