The Constitution stipulates that only "natural-born citizens" can hold the highest office, and there's never been a clear definition of what that means when it comes to citizens not born on US soil.
Editorial note: Whoa! You've found a super-old post here on BuzzFeed, from an earlier era of the site. It doesn't really represent where we are anymore, and may in fact be totally broken, but we're leaving it up as a part of our early history.