There is no record of his naturalization; he is not, nor ever has been a U.S. citizen.
If the lone American citiizen parent is under the age of 20, at the time of BObama’s birth - It is impossible for BObama to be a natural-born American citizen.
However, if he held dual citizenship, as an adult, he would still be a citizen but NOT eligible to run for President.
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)