According to this link from Little Green Footballs, it seems as though Blagojovich was simply looking for the closest facsimile of Obama that he could find to fill the empty position: a do-nothing black guy with an hyperinflated ego and a penchant for grandiose public display.

Political Honesty....

If on the other hand it was required to be honest with no shady dealings or history thereof, you would have an empty room available for rent as a bingo parlor.