The Exemption

So apparently, there are a couple of ironclad rules about post-WW II Presidential politics:

• You can't get elected President if you're from North of Misssouri
• You can't get elected President if you're a sitting member of Congress

There is only one exemption:

You must be a Senator from Massachusettes who skippered a small boat in combat with bravery who has the initials of J.F.K.