21. WHEN MEMBERS SHALL VOTE - PERSONAL INTEREST - CHANGING VOTE
(a) Every member who shall be within the House chamber when a question shall be stated from the chair shall vote thereon, unless the member is directly interested in the question or shall have been excused from voting by the House; but, when a vote is taken without the use of the electric roll call system, no member shall be obliged to vote upon any question unless the member is within the House chamber when his or her name is called.
(b) A request by a member to be excused from voting shall be made before the call for the ayes and noes has begun; any member desiring to be excused from voting on a question shall make a brief statement of the reasons therefor, and the question shall be put without further debate.
(c) A member who has an immediate personal or financial interest in any bill or measure proposed or pending before the General Assembly shall disclose the fact to the House, and shall not vote upon such bill or measure.
(d) When a vote is taken without the use of the electric roll call system, a member shall be allowed to change his or her vote before the result has been announced, but not thereafter.
(e) A member shall not be compelled by a majority of a political caucus to cast a vote for or against any legislative measure.