I agree, it is a big deal. But, if he is not an American citizen, then we have a Constitutional crisis on our hands. And, that will be horrible. Of course, it would be one way to get rid of Obamacare, and a couple of un-qualified Supreme Court Justices; but, the war that would be waged over this would be bloody.
I have often wondered myself why he just doesn't present the damned certificate. I first thought that perhaps he wants this controversy so that he could pummel republicans over the head with it. I am now wondering if he is hiding something, especially after the dimwit Governor of Hawaii decided, so publically, to find the birth certificate and present it --- only to find, the hospital can't find it (oh, wait, no the second excuse is that he is not the person of record, so he can't have the certificate -- right). The big thing would be not having been born in the United States. Second, maybe his parents were not actually married. I'm sure there could be other reasons; but, I give Trump credit for taking the flak and asking the questions.