No member of the Oklahoma Tax Commission shall, directly or indirectly, solicit, receive or in any manner be concerned in soliciting or receiving any assessment, subscription or contribution for any political organization, candidacy or other political purpose. No member of said commission shall be a member of any national, state or local committee of a political party, or an officer or a member of a committee of a partisan political club, or a candidate for nomination or election to any paid public office, or take part in the management or affairs of any political party or in any political campaign, except to exercise his right as a citizen privately to express his opinion and to cast his vote.