But a SMART conservative who has read the law can say that Obama is not a Brit if his mother was not legally married to Sr...as in a BIGAMOUS marriage that is void ab initio. It is VOID not voidable.
If he can't prove his LEGAL parents citizenship at the time of his birth he is not an NBC. His mother was not of legal age to convey citizenship to him. So, at best he is a native citizen if he can prove he was born in the U.S. At worst he is a bastard illegal alien.