I know that this quote is 52 years old, but nothing has changed, except a more tactful way of putting it in print -
* w56 11/1 p. 648 How True Christians View Politics *
Today the Christian witnesses of Jehovah, like the witnesses of Jehovah in the early days of Christianity, keep unspotted from the world. They conscientiously refrain from taking part in the politics of this world, yes, even from voting. They know that political participation not only would be futile but would bring God’s disapproval. Maintaining the true Christian view of politics will help you keep unspotted from this wicked system of things and gain everlasting life under the perfect government of the post-Armageddon new world.
In my old "Shepherding The Flock " book, anyone guilty of what they cal "Non neutral activities" would be viewed as disassociated. I believe it is still the same and voting is one of those actions. You would have to claim that you entered the booth and spoilt your paper , and think of a reason why.