No.
If so, are you saying that anyone can challenge school district policies even if those policies have no effect on them?
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No.
Nedow could not go to a federal court and assert that the California courts were denying him his rights under state law. Under the principle of federalism, federal courts may not determine that a state court has improperly applied state law.
Nedow could, however, go to a federal court and assert that the California courts were denying him his rights under federal law.
Whether Nedow’s claim is successful is another question.
Going to federal courts and claiming that a state court has denied a person his/her federal rights is quite common - a well-known form of this are writs of habeus corpus brought in federal courts by state prisoners.
I am saying something completely else altogether.
This is the starting point: the federal government and the states set their own rules as to whom has standing to bring a cause of action in the respective court systems. The federal court follows the federal rules, and the state courts follow the state rules.
To present a ridiculous example, if Congress were to pass a law holding that any person related by blood or marriage to a child who habitually wears purple clothing has an interest in any matter affecting that child, then a purple-clad second cousin twice removed has standing in federal courts.
If the state rule requires that the individual must be the custodial parent, our second cousin cannot bring suit in that state on behalf of a child.
Now, there is a constitutional constraint on federal standing rules: there must be an actual “cause or controversy” before a party has standing. To determine whether there is an actual cause or controversy, it must be determined whether the individual bringing suit has an interest in the outcome of the case. To make that determination, a federal court may look to what interest the individual has under applicable state law, but the state’s determination of interest is not binding on the federal court - the individual may also have interest that is recognized by federal law but denied by state law.
If Congress had passed a law that states that “standing in federal courts is determined by state law,” then state determinations of interest would be binding on the federal courts. Congress did not, so the federal courts are not so bound.
This is federalism. As a practical matter, federal and state rules on standing, based as they are on a shared common law tradition and concepts of justice, are very similar - if one has standing to bring an action in one system, the odds are high that one has standing to bring the same action in the other system, and if one doesn’t have standing in one system, the odds are high that one doesn’t have standing in the other system. But they are not identical, and a determination of standing in one system is not binding on the other system.
Sua