IMHO, he ought to make the challenge that he'll release his tax return if and when Obama releases his college records. All of them.
It would be one of the first respectable things he's done.
(I still wouldn't vote for him...but he should still do something along those lines)
PARTIAL LIST OF DOCUMENTS THAT BARACK OBAMA REFUSES TO RELEASE -. OBAMAS SECRECY AND CLOSED RECORDS POLICY
Indonesian Passport Not released
Application for U.S. Citizenship (as former citizen of Indonesia) Not released
Immigration Records Not released
Original Vault Copy Birth Certificate Not released
Certificate of Live Birth Counterfeit Version on Obama Web Site
Obama / Dunham Marriage License Not released
Soetoro / Dunham Marriage License Not released
Soetoro Adoption Records Not Released
Fransiskus Assisi School Application Not released
Punahou School Records Not released
Selective Service Registration Counterfeit version generated
Occidental College records Not released
Columbia College Records Not released
Columbia Thesis Not released
Harvard College Records Not released
Baptism Certificate None
Medical Records Not released
Illinois State Senate Records Not released
Law Practice Client List Not released
University of Chicago Scholarly Articles None