Actually if he was born in Kenya, he's not a natural born citizen. The rules state that if you are born overseas and have one parent that's an American citizen and has lived in America for 5 years after the age of 16 that you are a natural born citizen. Since Obama's mother was 18, if he was born in Kenya, he's not a natural born citizen.
Now, he was just elected our President and when he gets in I intend to give him my support until he does something to deserve my distrust of him. However, that doesn't mean I have to like it. I still have problems with a guy who went to Pakistan at the age of 20 on an Indonesian passport and claims to be a "citizen of the world". IMO, we need and American as our POTUS, but then again, McCain isn't exactly what I would call an American either.