In all lawsuits, plaintiffs must have standing to sue. In federal court there must be:  (a) a controversy which falls within the ambit of cases the federal courts can hear; and (b) a plaintiff suffering from or having the potential to suffer a real and direct injury. Without these two conditions you can’t sue.

Further, standing is necessary when a suit gets filed and during the entire process. If the risk of a direct injury when you sued goes away—because, for example, your status changes or a law you are complaining about gets repealed—your suit cannot go forward.

So standing has become an issue in King v. Burwell, the case challenging Obamacare subsidies. Here’s Cristian Farias at New