Many people don't understand the issue dealing with  Barack Obama's birth certificate.  If Barack Obama doesn't  meet the limited constitutional qualifications for president he cannot legally exercise the powers of the office.  The fact that his claim about being born in Hawaii have been accepted in the past  doesn't mean the claim is valid. 

If Obama was actually born in Hawaii all he has to do is authorize  Hawaiian officials to show his original birth certificate to the media, possibly with the restriction that journalists not make a copy of it or show the document on television.  The computer generated  document Obama  has on his website   to prove he qualifies as a "natural born citizen"  isn't adequate because it would be too easy to forge as  Israel Insider has suggested in a series of articles.   

I had to obtain a copy of my birth certificate last year when I retired to apply for my state pension.  It's an actual copy of the original which was handwritten on a printed form and included the doctor's signature.  I don't know if the state stores the original documents or maintains copies on microfilm.

The document Obama is using includes only a limited amount of information that could easily have been placed on the computer by a hacker.   If Hawaii actually provides such documents, I suspect that those wishing to establish fake citizenship  choose Hawaii as the state they were supposedly born in.

If  Obama is running for president even though he knows he isn't qualified, he probably wouldn't feel bound by constitutional limits on the president's powers.  We've had enough problems with presidents wanting to expand their powers in recent decades.  We don't need a president who runs for office in violation of the Constitution.

Failure to present evidence that he is qualified to be president could create a constitutional crisis.

Republicans could challenge his election in Congress when the electoral colleges ballots are counted.  If anyone on the Republican side has information that Obama isn't qualified to be president, they would likely not release that information until after he is nominated to discredit the Democratic Party.  

Any government agency that can prove Obama isn't a citizen might use that information to blackmail him rather than make the information public as J Edgar Hoover is believed to have done.

An unqualified president cannot sign legislation into law.  Someone charged with violating new laws could challenge the constitutionality of the laws and request the government to prove that Obama is a "natural born" citizen of the United States. 
  
After 9/11 we learned that many government officials had been lax about issuing government documents.  Obama may not have had to have a birth certificate when he moved in with his grandparents in 1971.  He would have obtained a passport when he was very young because his mother moved across national boundaries.  In the 1960's he probably would not have needed a birth certificate if his mother provided a statement about his birth.