Why Won't Racist, Xenophobic Birthers Shut Up?

First they complained because he is a Black man, who overcame whitey and made his way in the world. Next they raised Hell about his going to a church that actually teaches truth. Then they called him a Muslim, like it was a slur. Now, after all else has failed, they attack him for his place of birth. Why does it even matter that he just happened to be born born in Kenya? He is still an American citizen, a great man, and a fine president - regardless of what the racists and the bigots have to say.