What's it got to do with him whether the Hawaiian one is real or not? I thought we were talking about you believing it was real?
Regarding him "changing his his mind", what if it was because he was running for president and it was a tactical decision? He would have known that the vast majority of his potential voters have been brainwashed by the MSM, who were selling the birther story as a 'conspiracy theory', so he probably just wanted to avoid the 'Trump Believes in Conspiracy Theories' headlines that were awaiting him.