That's not entirely true. In Kenya, the law does say a citizen can only be Kenyan and nothing else. Oboma had to deny his American citizenship after the age of 18. That's the law there.
BUT......
If he had a friend or relative in the government, he's given a pass and still remains a citizen. Odinga, the president of Kenya (who Oboma campaigned for) is Obomas cousin.
A president elect with duo citizenship is unconstitutional because he/she has duo allegiances.
AND......
Oboma would have to take an oath of citizenship in the United States to become a citizen the same way Immigrants from Mexico have to if he were not a natural born a citizen.
And of course you can quote the article of the Constitution that supports this?
Not to mention that is a violation of the Logan Act, a violation of the law, but broken and bent many times by Democrats all the way back to Kerry.
The Constitution says the president must be a "native-born citizen."
It does not say the president cannot also be a citizen of another country.
For example, let's say the child of a Japanese husband and British wife was born in Cleveland.
I believe that under the laws in these countries he would be from birth a citizen of both UK and Japan. Despite this, under our laws he would be a "native-born citizen" and eligible to be president when he reaches the age of 35.