The Supreme Court decided Monday not to take up a challenge to the country’s only law that sanctions same sex marriage. Conservative groups were hoping the Supreme Court would take the case and rule that the Massachusetts Supreme Court had unconstitutionally allowed same sex couples to marry. An attorney for the conservative groups said in a Supreme Court filing that the Constitution should “protect the citizens of Massachusetts from their own state supreme court’s usurpation of power.” The court Monday did hear arguments in a medical marijuana case. The federal government is prosecuting two California women who grow and use marijuana for health reasons.