Obama claims that the terrorist William Ayers is just some guy from his neighborhood that he barely knows. I have read that William Ayers and his wife Bernadine Dohrn used to baby-sit for the Obams's but I have seen no proof of that. (Michelle Obama and Dohrn worked at the same law firm in Chicago.) And, Obama and Ayers worked for together for many years on education reform. (I think that they viewed their efforts as attempts to improve education though to me their goal appeared to be to destroy it.) Ayers and Obama's supporter Linda Darling-Hammond want repayment of education deficit to people of color, otherwise known as reparations. It is not clear where Obama stands on that, though he seems to favor it. But, it is clear that he has had a close relationship with Ayers and Dohrn. Here is an article discussing the work of Ayers and Obama:

http://globallabor.blogspot.com/2008/07/wither-teachers-unions-obamaayers-link.html