http://www.thebulletin.us/site/index.cfm?newsid=20213282&BRD=2737&PAG=461&dept_id=576361&rfi=8
"The ads were met with derision by the Chicago Sun-Times
columnist Mary Mitchell, who cited a document put on the
Internet by the Obama campaign in the summer as proof for
why Mr. Obama is a natural born U.S. citizen.
The document that was put on Mr. Obama's "Fight the Smears"
Web site was not a birth certificate, but a birth
certification, which is a computer generated print-off of
information taken from a normal birth certificate. Further,
critics assert that there is evidence that puts the
low-quality scan in question."
Also see;