You have to think of why they have the natural born citizen requirement in the first place.

I would think that the founding fathers would want our president to have grown up like any tyipcal American...with typical American parents.
Lets face it, someone (like Obama) who grows up with a Kenyan father is not going to have the same life or childhood as a person with two American parents. They may not necessarily share the same values as the natural born citizen. It's just not the way it was supposed to be. Our President needs to 100% represent US...and in no way be influenced by another nation or culture. They have to be RAISED American to BE American in my opinion...

This is totally aside from the largest concern that another nation or entity could be trying to take over our government by planting a President...
This can be easily accomplished with enough cash. Just look at the records folks; Presidents who spend the most, WIN.