[Ouchthatonehurt]

Basically for the same reason we have never had a US Marine as President.
But things can change.

[FoxPro]

Basically for the same reason we have never had a US Marine as President.

This is a very good answer.

[BerryDingle]

Basically for the same reason we have never had a US Marine as President.

Once a Marine, always a Marine.

Along the same train of thought, if you usurp the office through voter fraud, you will never really think you are the President, so you will do nothing but campaign for 4 or 8 years.