Incorrect.
The Twentieth amendment, section three places the burden of proving eligibility upon the "President elect". If he/she cannot offer proof to Congress that he/she is qualified to serve as President, they, Congress, must name an interim President.
Incorrect.
The Twentieth amendment, section three places the burden of proving eligibility upon the “President elect”. If he/she cannot offer proof to Congress that he/she is qualified to serve as President, they, Congress, must name an interim President.
That's not what the 20th Amendment says, and the provision you're talking about is in the event of the death of the President elect. It also doesn't specify what proof Congress would require, either.
If Congress is satisfied with a post-it note from Hawaii saying, 'Obama's a natural born citizen', then they're satisfied. There's no formal standard, and trying to invent one in reverse just isn't going to fly with your average voter or congressman.
Setting formal documentation standards to the future is the way to solve this. (Everyone running for office must supply A, B, C and D, etc) It's not like that now. Since the standard is hard to prove (Who *really* knows where they were born? Unless there's video of your mother holding up a newspaper, and giving birth next to a public landmark, you're pretty much taking someone else's word for it.)
Obama can easily claim that to the best of his knowledge, he is a natural born U.S. citizen. Even if there's no paperwork to back it, and in the absence of formal requirements, most people (including congress) will give him the benefit of the doubt. It's no more complex than that.