[TK Burk]

This is an interesting explanation of Obama's citizenship:

FactCheck.org

In other words, at the time of his birth, Barack Obama Jr. was both a U.S. citizen (by virtue of being born in Hawaii) and a citizen of the United Kingdom and Colonies (or the UKC) by virtue of being born to a father who was a citizen of the UKC.

Obama's British citizenship was short-lived. On Dec. 12, 1963, Kenya formally gained its independence from the United Kingdom. Chapter VI, Section 87 of the Kenyan Constitution specifies that:

1. Every person who, having been born in Kenya, is on 11th December, 1963 a citizen of the United Kingdom and Colonies or a British protected person shall become a citizen of Kenya on 12th December, 1963...

2. Every person who, having been born outside Kenya, is on 11th December, 1963 a citizen of the United Kingdom and Colonies or a British protected person shall, if his father becomes, or would but for his death have become, a citizen of Kenya by virtue of subsection (1), become a citizen of Kenya on 12th December, 1963.

As a citizen of the UKC who was born in Kenya, Obama's father automatically received Kenyan citizenship via subsection (1). So given that Obama qualified for citizen of the UKC status at birth and given that Obama's father became a Kenyan citizen via subsection (1), it follows that Obama did in fact have Kenyan citizenship after 1963. So The Rocky Mountain News was at least partially correct.

But the paper failed to note that the Kenyan Constitution prohibits dual citizenship for adults. Kenya recognizes dual citizenship for children, but Kenya's Constitution specifies that at age 21, Kenyan citizens who possesses citizenship in more than one country automatically lose their Kenyan citizenship unless they formally renounce any non-Kenyan citizenship and swear an oath of allegiance to Kenya.

Since Sen. Obama has neither renounced his U.S. citizenship nor sworn an oath of allegiance to Kenya, his Kenyan citizenship automatically expired on Aug. 4,1982.