A majority in the House of Representatives could provide Donald Trump with the necessary power to cement some of his most ambitious policy plans—or could serve as a critical check on his worst impulses. The steady erosion of power from the legislative branch to the executive over several decades means the congressional majority is less important than it ought to be. Still, the one remaining piece of the 2024 election puzzle is a big prize, and as of Wednesday afternoon, it remains unsettled. The results in the few handfuls of yet-to-be-called House races will set the stage for next year’s huge…