for the previous seven years. There is no requirement that a Representative reside within the district in which he or she represents; although this is usually the case, there have been occasional exceptions. The Supreme Court has interpreted the Qualifications Clause as an exclusive list of qualifications that cannot be supplemented by a house of Congress exercising its Section 5 authority to "judge...the...qualifications of its own members" or by a state in its exercise of its Section 4 authority to prescribe the "times, places and manner of holding elections for Senators and Representatives." The Supreme Court, as well as other federal courts, have repeatedly barred states from additional restrictions, such as imposing term limits on members of Congress, allowing members of Congress to be subject to recall elections, or requiring that Representatives live in the congressional district in which they represent. A 2002 Congressional Research Service report also found that no state could implement a qualification that a Representative not be a convicted felon or incarcerated. However, the United States Supreme Court has ruled that certain ballot access requirements, such as filing fees and submitting a certain number of valid petition signatures do not constitute additional qualifications and thus few Constitutional restrictions exist as to how harsh ballot access laws can be. Finally, although the U.S. Constitution places no restrictions on state or local office-holders simultaneously holding federal office, most state constitutions today effectively ban state and local office holders from also holding federal office at the same time by prohibiting federal office holders from also holding state and local office. Unlike other state-mandated restrictions, these sorts of prohibitions are constitutional as long they are enforced purely at the state level (i.e. against active federal office holders seeking to obtain or hold a state or local office). Clause 3: Apportionment of Representatives and taxes After much debate, the framers of the Constitution decided to make population the basis of apportioning the seats in the House of Representatives and the tax liability among the states. To facilitate this, the Constitution mandates that a census be conducted every ten years to determine the population of each state and of the nation as a whole and establishes a rule for who shall be counted or excluded from the count. As the new form of government would become operational prior to the completion of a national census, the Constitution also provides for a temporary