There is the further complication of her marriage to an Indonesian and a lengthy residency in Indonesia. But beyond the legal stuff, which I think is a stretch, because Hawaii was willing to issue him a certificate of birth, it has to do with his lack of attachment to this country. His mother seems to have little respect for this country and he not much more. The only American and he seems really at home with are progressive academics. Certainly at the famous Berlin rally he case himself as a citizen of the world, with evident disdain for American patriotism.
“Hawaii was willing to issue him a certificate of birth” I believe they called it a “certification of birth” which they issued with little regard to where the child was actually born. But it’s a bit late for this now. Of course, if Obama were found to have been born outside the US, then everything he signed and ordered over the last 7 years would be invalid.
And the fact hat Obama attended an Indonesian school that required students be Indonesian citizens, yet Indonesia and the US do not have a dual citizenship treaty.