Professor Amar and colleagues have weighed in (heavily) on the ISL danger, as they filed a brief with the Supreme Court in the case of Moore v. Harper. The brief is garnering wide attention with its powerful argument, as well as an innovative format. We review the background to the case and the brief, and then take you through the argument point by point. Law and history come together to make the case in this most consequential matter. Judging from the response, the country is watching.