Well, maybe. Citizen for sure, under the law at the time, (and today as well if had been born under current law). But, Natural Born Citizen within the meaning and intent of the Art. II clause in the Constitution?
Congress can define who is eligible to be naturalized, as that is the only power over citizenship granted to them, they cannot redefine "natural born citizen", for purposes of the Constitution, anymore than they can define "speech", "religion", or "arms".
Looking at all the possibilities of a definition leaves us with the gut feeling that this guy ain't. But he's got a legal team for every angle, and his PR campaign is trailing smoke like a line of WWII destroyers, so our shooting is very difficult, and the lawsuit torpedoes we have launched at the SOB have so far been legally way off target.
IMHO, as I have expressed to the occasional derision of us Freepers, we have to back-track and create the state laws that will demand documentary evidence of eligibility. Then at least someone will have the "standing" to sue.
In the meantime, we've got a clear case of forgery on our hands,too, but are having a hard time even getting that to court.
The left has a fervent belief in the Hegelian Dialectic as improved by one K. Marx. "Created Chaos," is an ideal they seek so that they, the creators, are the only ones who can bring a resolution forward. This is driving everyone crazy, because that is exactly what it is intended to do while Obama and his cronies abuse the power given to them in the last election, whether they stood for election fraudulently, or not.