On November 21, 2014, the U.S. House of Representatives did something it had never done before—it filed, as plaintiff, a lawsuit against a coordinate branch of the federal government. In doing so, the House chose to stage its separation of powers battle in the courthouse rather than the public square. In its simplest form, the House’s suit charged the Obama Administration with spending money that Congress had not yet appropriated, which, if true, is almost surely a violation of the Constitution’s Appropriations Clause.The stakes of the suit, captioned House v. Burwell, are as high as the suit is novel