It would prove he was a citizen at birth.
But...He was adopted by an Indonesian man and lived in Indonesia. Did Obama go through the normal process of repatriation? Did he travel on a foreign passport? Did he claim foreign citizenship to gain entrance to college? Did he accept scholarships claiming to be a foreign student?
None of these actions have any effect at all on an American's citizenship status.
Might raise some very good questions about integrity and so forth, but wouldn't affect legal status of citizenship.
Dual citizenship is not legally recognized by the US. I could acquire Mexican, Chinese, Zimbabwean and Peruvian citizenship, and it wouldn't change my status as a US citizen unless I specifically and legally renounced my US citizenship.
And I am reminded of his trip to Pakistan and Indonesia with his Muslim buddy form Occidental College back in 81 when Pakistan was on th e’No fly “list,and Christians, Jews, and Americans were not welcome in Pakistan.What passport did the shadow use?My appologies to an old and good radio show.