Quite a feat, since the organization disbanded in 1969.
Obama has long been involved with "former" SDS members, and gave his first public speech in college at an event sponsored by an SDS successor organization, the Students for Economic Democracy:
Obama's first public speech was at an Occidental event sponsored by the Students for Economic Democracy, a group affiliated with far left radical Tom Hayden and Hayden's militant group SDS (Students for a Democratic Society.) David Peck, an organizer of the Occidental rally, is now coordinating Americans in Spain for Obama.
In 1969 Hayden's SDS began breaking into groups including a group calling itself Weatherman. The group proclaimed that the time had come to launch a race war on behalf of the Third World and against the United States. The new entity formed a terrorist cult and was given the name Weather Underground. Two of the Weather Underground founders were Bernadine Dohrn and Bill Ayers. The group is most famous for a campaign from 1969 through the middle 1970s of bombings and riots including the bombing of the US Pentagon in 1972.
http://www.americanthinker.com/2008/10/obama_and_dohrn_and_ayers.html
It is quite different to say Obama was involved in 1980 with people who used to be part of SDS, and to say he was involved with the SDS itself.
I’m aware of his association with Ayers.