But yes, by the Kenyan Constitution, I believe he became a Kenyan citizen on its independence day by virtue of his father's birth in Kenya/eligibility as citizen.
But also by Kenyan Constitution: "A person who, upon the attainment of the age of twenty-one years, is a citizen of Kenya and also a citizen of some country other than Kenya shall, subject to subsection (7), cease to be a citizen of Kenya upon the specified date unless he has renounced his citizenship of that other country, taken the oath of allegiance and, in the case of a person who was born outside Kenya. made and registered such declaration of his intentions concerning residence as may be prescribed by or under an Act of Parliament." Does anyone have any evidence Obama renounced his U.S. citizenship?