My opinion is that binding and official mean the same thing, that the result must be followed. We should eliminate the term official and classify polls solely on whether they are binding or not.
Calling some polls official and some polls not official introduces an unnecessary and damaging distinction between citizens and officials. Using the term "official poll" misleads citizens into thinking that only officials can post binding polls, and gives officials a false sense that they are somehow above the citizens. In our DG society, officials should be servants to the people, not masters over them.
Saying an official cannot post a citizen poll is essentially denying the official is a citizen. Take a very straightforward kind of poll from our current game's rules, which happen to match the last Civ3 game rules on the same topic. Our current law restricts the power to declare war to a vote of the citizens. If we restrict the ability to post a citizens poll to non-officials, then the Secretary of State and Secretary of War are both prohibited from posting a poll on approving a declaration of war. One would think that these two individuals would naturally be the best informed on the current situation, and therefore the best qualified to post the poll. Instead, they must approach some other citizen to create the actual poll.
Why is there a need to have a special kind of citizens poll? I myself decided to try this experiment of having two kinds of binding polls, to ensure that citizens would always have the right to demand a poll on an issue. Instead of a simple interpretation that citizens can overrule officials, we got several terms of conflict over the definition of "official". My experiment, and I do claim responsibility for it, was a failure. Now I suggest we simply have a rule that an official must poll an issue if the citizens request it. Leave the very necessary ability of citizens to post binding polls and keep the rediscovered concept that the last poll on an issue overrides previous polls, and we don't need to distinguish between official and non-official. In this case, simpler is definitely better.