In fact, it identified me by my ISP address, so the only way Barcode, or anyone can cheat on this poll is to create multiple ENWorld accounts from different ISP locations, which are not from your own house, unless you have multiple routers, or a business with multiple routers, and you know which computers go through which routers.
You definitely cannot do it from the same ISP address, and not be signed in, even with cleared cookies, or else I would have been able to vote again yesterday.
That or I have a mutant ISP.