A month ago, the U.S. Supreme Court voted 9-0 to strike down a Massachusetts law that created a 35-foot buffer zone outside abortion clinics. Kelly Kleiman, a lawyer-turned-consultant for nonprofit organizations, wanted to know why the vote in that case — McCullen v. Coakley — was unanimous. So she went to Mayer, Brown LLP on Friday for the 11th annual Supreme Court Review, hosted by the American Constitution Society Chicago Lawyer Chapter and the American Civil Liberties Union of Illinois, where Kleiman …