“We argued, as we thought then rather logically, that no social class was so good, so true, and so disinterested as to be trusted wholly with the political destiny of its neighbors; that in every state the best arbiters of their own welfare are the persons directly affected; consequently that it is only by arming every hand with a ballot,—with the right to have a voice in the policy of the state,—that the greatest good to the greatest number could be attained.”