Even if Obama produced authenticated proof of his birth in Hawaii, however, the suit claims that the U.S. Nationality Act of 1940 provided that minors lose their American citizenship when their parents expatriate. Since Obama's mother married an Indonesian citizen and moved to Indonesia, the suit claims, she forfeited both her and Barack's American citizenship.
However, there doesn't seem to be any evidence Ann Dunham expatriated. Also, consulting citizenship experts contend that if Obama indeed obtained Indonesian citizenship, it simply would not have been recognized by the U.S., but the presidential candidate would retain his American citizenship.