Three years ago, midway through his State of the Union address, President Barack Obama took on the Supreme Court of the United States of America. “With all due deference to the separation of powers,” the president said, “last week the Supreme Court reversed a century of law that I believe will open the floodgates for special interests—including foreign corporations—to spend without limit in our elections. [Applause.] I don’t think American elections should be bankrolled by America’s most powerful interests, or worse, by foreign entities. [Applause.]” Justice Samuel Alito, by mouthing the words “not true” as Obama read these sentences off...