Everything described in the post below is Hyperlinked to a site within the Chicago Democratic party archives, there is no conjecture, no guessing, The fact is that as recently as 1996 Senator Obama was an active member of the Chicago Democratic Socialist Party:
On their website the Democratic Socialist of America (DSA) has a description of their political perspective called Where We Stand. It says, in part,
According to its newsletter called The New Ground ,Senator Barack Obama attended at least a few meetings of the Chicago Chapter of this group in 1996. And from the way it was described in the newsletter he "talked the talk" and "walked the walk" and even signed a contract with the group.
We are socialists because we reject an international economic order sustained by private profit, alienated labor, race and gender discrimination, environmental destruction, and brutality and violence in defense of the status quo.
We are socialists because we share a vision of a humane international social order based both on democratic planning and market mechanisms to achieve equitable distribution of resources, meaningful work, a healthy environment, sustainable growth, gender and racial equality, and non-oppressive relationships.
To see all the evidence, CLICK HERE