I agree with SP1N 100%; nothing is worse than when you are fighting a tough opponent at low health and end up dying because someone decided to initiate a commander poll halfway into the round. Yes, it's a minor distraction, but a minor distraction at the wrong time can make all the difference. As such, I would personally welcome an option to either hide polls or automatically vote no on every single commander poll.
I also agree with what San said about some sort of disincentive or penalty for failing polls. There is a minority of people who try and use the commander poll for its intended purpose of trying to get the team to work together, but the majority of people who get commander on NA just use it to fill up chat with nonsense. These same people also tend to be ones who attempt to initiate the commander poll constantly, at every single opportunity they have to do so, and who never give up despite failing nearly every single time.