A scramble by Democrats on Capitol Hill to prevent a particular vote on a particular bill highlights for us two of the most pernicious threats to our liberties. Here’s the story. In 2009 the Obama administration’s Environmental Protection Agency classified carbon dioxide gas—what you exhale from your lungs and what all plants breathe in—as a dangerous pollutant that the federal government can regulate. This means the EPA can regulate automobiles, manufacturing facilities, and pretty much every activity necessary for the support of human life. But under the Congressional Review Act, passed as part of the Republicans’ Contract for America in...