Ark. Const. art. 5, § 18

Each house, at the beginning of every regular session of the General Assembly, and whenever a vacancy may occur, shall elect from its members a presiding officer, to be styled, respectively, the President of the Senate, and the Speaker of the House of Representatives; and whenever, at the close of any session, it may appear that the term of the member elected President of the Senate will expire before the next regular session, the Senate shall elect another President from those members whose terms of office continue over, who shall qualify and remain President of the Senate until his successor may be elected and qualified; and who, in the case of a vacancy in the office of Governor, shall perform the duties and exercise the powers of Governor as elsewhere herein provided.