Judicial purdence

Answer the follow in 100 words: 

before the federal courts often involve a Constitutional question. But is it appropriate for the court to act if Congress and the President have not? Does this result in an overreach of the judicial branch that interferes with checks and balances? Does it result in an overreach into state and local affairs or is it necessary to ensure "equal justice under the law" and "due process of law" when a state or local government may be overreaching?