There's a couple of ways to look at that. On the one hand, Obama's mother was American and he was raised by his grandparents in Hawaii for quite a while. So in a sense it's a technicality if Obama happened to be born while his mother was not in the country, even tho at the time he might not have been - hence, still might not be - actually an American citizen. Whereas so many "anchor babies" are born to Mexican mothers who arrange to be in the States when their babies are born.OTOH his earliest memories were formed outside the US under the tutelage of a foreigner, muslim, stepfather - and Obama himself has never won an election without knocking at least one opponent off the ballot in a courtroom.
No one is questioning if he is a citizen. It’s whether he is a natural born citizen.
And technicality or not, it’s still a constitutional issue.