So this lady's blog is awash of right-wing fear mongering, but I do agree with her on this one. She makes a simple point that race and nationality are not one and the same. The post is at http://michellemalkin.com/2010/03/09/my-race-is-american/
I have made this case before, and I really like her solution to this problem when answering the census, list your race as American. There is no sense in only allowing white people to call themselves American, while leaving everyone of different races with a different name.