Administrative expenses of the Commission shall be paid 50 per centum by the Federal Government and 50 per centum by the States in the region, except that the expenses of the Federal Cochairman, his alternate, and his staff shall be paid solely by the Federal Government. The share to be paid by each State shall be determined by the Commission. The Federal Cochairman shall not participate or vote in such determination. No assistance authorized by this Act shall be furnished to any State or to any political subdivision or any resident of any State, nor shall the State member of the Commission participate or vote in any determination by the Commission while such State is delinquent in payment of its share of such expenses.