"Today, we follow the principle announced by the Supreme Court nearly fifty years before the right to an abortion was found in the penumbras of the Constitution and hold that Mississippi may not shift its obligation to respect the established constitutional rights of its citizens to another state. Such a proposal would not only place an undue burden on the exercise of the constitutional right, but would also disregard a state’s obligation under the principle of federalism—applicable to all fifty states—to accept the burden of the non-delegable duty of protecting the established federal constitutional rights of its own citizens."