MHG,
Not being tricky or obtuse. Seriously trying to determine whether he is hiding the NB status or something else. I am not a constitutional scholar so I am asking an honest question. To my limited knowledge it seems he could use the fall back that Obama and Dunham were never legally married and although embarrassing it would still convey Natural Born status.
When a court finds that a marriage with children involved is void due to bigamous charges, the court stops short of making legal bastards of the children ... the remedy stops short of declaring innocent parties illegitimate because that would be court appointed punishment for innocent parties.