It would appear very strange that he would have the same date. Okubo needs to do some explaining. Why in the world would Obama and Okubo get a certificate on the very same day? One reason. They didn't, it was used as a template for fraud.
I think a fish has been hooked. They didn't see the date bleed through. This is 2007? A full year and a half before the election, before any questions were raised.
In Obama's COLB, you can clearly see the date stamp "resting" on top of the background pattern, and not coming through from the other side. A few folks at HotAir also zeroed in on the "busted-up 6" in June 6, 2007 - meaning the JPG blocking was different from the rest of the image.
I have a video showing how the date-stamp, Seal, and registrar's stamp were all added to the front side as separate layers.
Here's a real 2007 COLB. you can see the date-stamp showing through the paper. You can also see the Registrar's stamp showing through the paper about the same amount as the date-stamp - this is the way it should be. The Registrar's stamp on Obama's COLB was far less visible: although you can see traces of the "h" in PhD, the block of text on the Registrar's stamp is illegible.