Will Obama's deals with that Rezko hurt his campaign?

Who is Obama really - that is my question. We know he has a shady past and affiliations with black separatists who's goal is to divide this country. Given that Rezko helped Obama and Michelle find their Mansion for $300,000 under market value - would signal to me their close ties go well beyond a casual relationship. What and who was Obama affiliated with before 1997 when he entered into U.S. Politics - just who is Obama ? Rezko is a crook.