The Commission on Special Investigations is continued. The commission shall continue to be composed of the President of the Senate and four members of the Senate, to be appointed by the President of the Senate, no more than two of whom shall be from the same political party; and the Speaker of the House of Delegates and four members of the House of Delegates, to be appointed by the Speaker of the House of Delegates, no more than two of whom shall be appointed from the same political party: Provided, That in the event the membership of a political party is less than 15 percent in the House of Delegates or Senate, then the membership of that political party from the legislative house with less than 15 percent membership may be one from that house. The commission shall be chaired by the President of the Senate and the Speaker of the House of Delegates. All members appointed to the commission by the commission chairs serve until their successors are appointed as provided in this section.