He's doing the same about the eligibility. After Obama, anybody can be President. And illegal mexican may be out commander in chief tomorrow. That's why he's ignoring it. He was probably born in NJ for all we know. He may not be hiding anything. But his failure to prove it with documents sets a precedence for all future Presidents.
I don't refer to them as birthers... they're more like constitutionalists, if you ask me.