So what if it shows a witness said Obama was born in Hawaii - no doctor or not born in a hospital?
Then I will probably think that I have been wrong.
Then it will be up to the birthers to prove that the witness committed fraud, which they won't be able to do.
But it won't come to that. At most, Obama will simply let the Congressman examine physical copy of the same COLB document that was photographed on Factcheck, and the Congressman will say he is satisfied.
In the very unlikely event the Congressman says he wants to see the long form, Obama will simply say the COLB is sufficient to prove his place of birth in any court of law (which it is), and that will be the end of it.