Why has the Obama campaign pressured Princeton University to restricting access to her dissertation?

What secrets lie in the dissertation that public can't have access to? As a general rule, all dissertations are supposed to be public record. For obama preaching against wihholding of information and government reform why has his campaign taken this stand?

http://www.politico.com/news/stories/0208/8642.html

Click on link about debate relating to Michelle's dissertation.

To cover something up.

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