Courts legislate when they engage in severability analysis , allowing part of a law to continue in force, after having struck down other parts as unconstitutional. This is flawed for the same reason that the legislative veto and the executive line-item veto are flawed. All involve creating a legislative outcome without the joint approval of both houses and the executive. The practice derives from an analogy to contract enforcement, where a court will try to preserve part of a contract when the rest is unenforceable. However, the analogy is imperfect because Congress and the state legislature remain in a position to pass a new law, unlike the parties to a contract who might not be in a position to create a new bargain. No appeal to convenie...