Photographs from multiple angles were also posted later, and they clearly indicated the document meets all the legal requirements.
What was posted was also altered (certificate number blacked out), which according to the posted document invalidates that document for all legal purposes.
The image was altered, not the document itself. Furthermore, the photographs posted later did not black out the number but showed it clearly.
Obama would have to make available the actual physical copy of the document so that both sides could be inspected by people.
He did make it available at his campaign headquarters. The only people who bothered going there to inspect it were the factcheck people.
I wouldn't count showing a document briefly only to a partisan as good enough.
Also, from those photographs, the document looked pretty crisp for something that was supposed to be several years old. I'm just saying, from the obliquely angled photos that I saw.
-PJ