Factually incorrect conclusion. If Obama was born in Kenya (or anyplace else not in the US) he can not be a citizen at birth. The law in effect at the time of Obama's birth was:
1952 The Immigration and Nationality Act of June 27, 1952, 66 Stat. 163, 235, 8 U.S. Code Section 1401 (b). (Section 301 of the Act).
"Section 301. (a) The following shall be nationals and citizens of the United States at birth:
"(1) a person born in the United States, and subject to the jurisdiction thereof;
"(7) a person born outside the geographical limits of the United States and its outlying possessions of parents one of whom is an alien, and the other a citizen of the United States, who prior to the birth of such person, was physically present in the United States or its outlying possessions for a period or periods totaling not less than ten years, at least five of which were after attaining the age of fourteen years."
Obama's mother was not old enough to pass on citizenship as she could have been physically present in the US no more than 4 years 8 months and 6 days after she turned 14 even if you ignore all the travel outside of the US during that period.
bookmark / bump
Okay, so if he was born in Hawaii, he would be a natural born citizen?