REPRESENTATIVE CHRISTOPHER C. RANTS, Individually and as a Member and Speaker of the House of Representatives of the Eightieth General Assembly of the State of Iowa, and as Chairperson of the Iowa Legislative Council, and SENATOR STEWART E. IVERSON, JR., Individually and as a Member and Majority Leader of the Senate of the Eightieth General Assembly of the State of Iowa, and as Vice- Chairperson of the Iowa Legislative Council, Appellants, vs. THOMAS J. VILSACK, Governor of the State of Iowa, Appellee.