Page 307 U. S. 330
"This principle was clearly stated by Attorney General Edwards Pierrepont in his letter of advice to the Secretary of State Hamilton Fish, in Steinkauler's Case, 15 Op.Atty.Gen. 15. The facts were these: one Steinkauler, a Prussian subject by birth, emigrated to the United States in 1848, was naturalized in 1854, and in the following year had a son who was born in St. Louis. Four years later, Steinkauler returned to Germany, taking this child, and became domiciled at Weisbaden, where they continuously resided. When the son reached the age of twenty years, the German Government called upon him to report for military duty, and his father then invoked the intervention of the American Legation on the ground that his son was a native citizen of the United States. To an inquiry by our Minister, the father declined to give an assurance that the son would return to this country within a reasonable time. On reviewing the pertinent points in the case, including the Naturalization Treaty of 1868 with North Germany, 15 Stat. 615, the Attorney General reached the following conclusion:"
"Young Steinkauler is a native-born American citizen. There is no law of the United States under which his father or any other person can deprive him of his birthright. He can return to America at the age of twenty-one, and in due time, if the people elect, he can become President of the United States; but the father, in accordance with the treaty and the laws, has renounced his American citizenship and his American allegiance and has acquired for himself and his son German citizenship and the rights which it carries and he must take the burdens as well as the advantages."
Page 307 U. S. 348
"The opinion does not discuss the right of election of a native citizen of the United States when he becomes of age to retain American citizenship, and does not refer to the repeated rulings of the Department of State in recognition of that right, the exercise of which, as we have pointed out, should not be deemed to be inconsistent with either treaty or statute. We are reluctant to disagree with the opinion of the Attorney General, and we are fully conscious of the problems incident to dual nationality and of the departmental desire to limit them,"
“However, he’s not a ‘natural born citizen.’ His father was a Kenyan. Google the law: Perkins v. ELG, 307 U.S. 325 (1939).”
Nothing at all about that case implies that Obama is not a natural born citizen. If anything, it implies the opposite. Elg was born in the U.S. to Swedish parents, who subsequently took her to Sweden. SCOTUS ruled that her parents’ decision to claim Swedish citizenship for her did not prevent her from reclaiming U.S. citizenship later. Thus, she had the right to be a U.S. citizen all along. Since the only reason she had a claim at all to U.S. citizenship was that she was born here, she was a natural born citizen.
Besides, this case doesn’t apply to Obama, since he was raised on U.S. soil. Now, there is some confusion as to whether Obama may at some point have gained Indonesian citizenship without recaliming his U.S. citizenship. But that is not at issue in the case at hand.