Frankenstein Veto
We need to invent the idea of well-formed bills, with requirements of clarity, factorability and maybe focus. This probably means we need a new branch of the judiciary to adjudicate whether bills and edits thereto are well-formed before they can be enacted. This would allow you to make a precise definition of a line-item, and therefore a line-item veto, without allowing monstrosities like in the article, among other benefits.Edit: alternatively, just don't allow bills that do more than one thing.