Barack Obama - illegal immigrant?

A while back a forensic expert apparently proved that Obama's birth certificate was forged. (read the analysis here)
Now there is a lawsuit in federal court (link) started by a prominent Hillary Clinton supporter.

He also, reportedly, has had several other names, "Barry Soetoro", etc. Thus he was lying in his bar application in Illinois when he stated he has never gone under any other name.
He was adopted in Indonesia, and the lawsuit linked above contends that this negates any citizenship he might have had. I have no idea on this one but once you are a citizen, don't you keep that your whole life (assuming it isn't revoked)?

And then we get to the heart of the issue.
If he is not a natural born citizen, obviously he can't be president.
Not only that, but obviously he has not immigrated here (or at least hasn't stated he has) ... so, that would make him an illegal immigrant... and thus he would not even be eligible to be a senator...


It will be interesting to see how this turns out, but this could be a big problem for Obama, unless he manages to provide some answers.