Well, ok, the decision applying (or not) the 2nd Amendment to the States is important also but the case Citizens United is the one that is being re-argued before the Supreme Court's term properly starts in October. In non-legalese, what this means is that the Supreme Court is on the verge of over-ruling one if not two precedents concerning limitations on corporate expenditures on free speech. That blight on the Constitution known as McCain-Feingold may be removed. MC can only hope.
Click on the title of this post to read the NYTimes' remarkably even-handed article on this issue.