Jack Cashill is well known for the investigation that he has done on Barry Soetoro aka Øbama. This link has very good information and analysis from Jack Cashill relating to the Conneticut Social Security number.
What is interesting is that Cashill seems to have tied the use of the SSN to Bill Ayers. This is because Ayers was commuting between Chicago and Columbia University in the years 1984-1987 and Øbama arrived in Chicago in 1985. It is more than likely that Øbama first met Ayers at Columbia and that they met again in Chicago.
There are family connnections to consider including the relationship betweeen Peter Geithner and the father of William Ayers, as well as Peter Geithner and Ann Dunham.
It is definitely food for thought, because it is more than likely that Øbama forged the selective service record, and Ayers was a master at indentity fraud due to his Weather Underground activity.