What if I were to tell you that there is a political issue that galvanizes young voters? An issue that unites libertarians, independents, and African-Americans? An issue with bipartisan power, that works not only in cities, but has demonstrated strength in red states like Kentucky and West Virginia? It’s an issue likely to generate cases to be heard by the Supreme Court in the next decade and one on which the Trump administration’s leading law enforcement official—Attorney General Jeff Sessions—is already on the losing side politically. Given all that, you would think this issue would be a central part of...