The Feb 27,2008 story in the Jewish Press by Aaron Klein,accuses Obama of serving as a paid Director of a non-profit organization ( the Woods Foundation) that granted funding to a controversial Arab group that mourns the establishment of the State of Israel.
The co-founder of the group is Rashid Khalidi of Columbia Univ.,who is described in the article as a harsh critic of Israel.
Obama,says the article, was a Director from 1999 to 2002 and was compensated $6000 per year.
I suggest you read the entire Article, JewishPress.Com ,or from a print edition.
I am sure more info will follow.Perhaps Nader was correct.