The legal left and media are always last to know, but there are the makings of a correction in how the courts police conflicts between the political branches. President Obama's serial executive power abuses—on health care, immigration, marijuana and much else—may be inspiring a heathy rejoinder. Under the Constitution, Congress is supposed to create and amend laws and the President to faithfully execute them, but Mr. Obama has grabbed inherent Article I powers by suspending or rewriting statutes he opposes. The President has usurped Congress with impunity because he assumes no one has the legal standing to challenge him. Most...