Showing his birth certificate will not end this. The pertinent facts are already widely known and well documented, i.e. Obama's father was not a US citizen, and his mother had lived less than five years in the US past her 14th birthday at the time of his birth, thus could not pass US citizenship to him.
Obama never was, never could be, and never will be a Natural Born Citizen, just based on the facts already widely known and documented. It doesn't matter if he produces twenty million birth certificates; none of them will change the already widely known facts.
Exactly... He could have been born in the White House itself, and STILL would never be eligible due to his status as a Subject of the British Crown at birth. A fact he himself has admitted and stated several times. At the very least he is a dual-citizen and NOT a Natural Born American Citizen.