There. Fixed it.
You can't prove a negative. However, 0bummer could prove the positive: Produce the Long Form Birth Certificate, and dispel all doubts. Costs $10.00 in Hawaii, as I understand.
Why so non-transparent?
Because he figures he's net-benefiting from the whole birther fru-fru. So, why should he stop it? "Hey, Factcheck.org said my birth certificate was legit. Normal folks believe them! You guys are just a bunch of cwazy right-wing nuts!"